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tdharley
11-14-2007, 06:16 AM
My Chevy diesel has a "oil life" percentage caluculator built in to the DIC.

I have read that it does not just keep track of the mileage but also RPM's and other driving conditions to make the calculation.

What is your thoughts, 3,000......4,000......5,000 or take the advise of the DIC?

Ron Schoner
11-14-2007, 07:01 AM
Forget the computer. Oil is the cheapest thing and the the best way to keep your truck running for a long time.

Change the oil every 3000 miles. And the filters also. Its the best money you can spend.

Ron

snuffy
11-14-2007, 07:19 AM
I change mine every 4000 miles regardless and do an occasional oil analysis from Blackstone labs. I totally disregard the oil life monitor.

mrcomer
11-14-2007, 08:31 AM
I thought the owners manual said to change the oil every 7500 miles.

I change mine every 6000 so I can get the tires rotated at the same time.

Oldlthrneck
11-14-2007, 08:51 AM
The manufacturers have extended the oil change interval because of the better quality of oil available today. The oil change retailers have stuck with the 3,000 mile recommendation because it makes them a ton more money. I change my oil based on how I am using my truck. When I was working in Colorado I changed it more often. All the dust and heat, where I was working, was not good for it. If I am doing a lot of traveling and hauling, I change more often too. My DIC says I have 70% oil life left, but will change it as soon as I get to Houston, on Friday.

katkens
11-14-2007, 08:52 AM
I change mine every 10,000 miles whether it needs it or not. If you test will see there is better oil now than umpteen years ago. The DIC was initiated for a reason , to change oil when needed......Ken

SmokeyBare
11-14-2007, 09:00 AM
I switched to Synethic Oil some time ago. I change it every 5,000 to 6,000 miles.

I rotate tires every other oil change. Doesn't seem to make them last longer... just wear more even.

I also paid Mr GoodWrench to change fluids on my Allison Transmission, the Rear Differencial and the Power Steering fluids after 100,000 mile mark. They flushed out each system and refilled each using synethic oils.

nhunter
11-14-2007, 10:59 AM
I change mine every 6250m (10,000km). There is no need to do it sooner. The DIC in wifes Honda wants it done about every 8750 ( 14000km). The is better oils and filters now than when they can out with the 3000m rule.

DennisZ
11-14-2007, 11:11 AM
The owners manual for my 2001 Ford says to change the oil at a 3000 mile interval if used in severe duty environment, short trips, and specifically if you tow a trailer for more than 1000 of those miles. I change mine at 3000 mile intervals because of the towing and environment where I live.

Dennis

Uncle Rog
11-14-2007, 11:33 AM
Howdy, I use the DIC info and change out at 50%, usually at about 5000 miles, rotate the tires and dust off and touch up the oil on the K&N air filter, which I think keeps a lot of contaminents out of the intake system.

dieselengineer
11-14-2007, 05:56 PM
Change the motor oil around 5000 miles. The big question is how often change the oil in the transmission, front and rear differentials. The trans & diffs get real hot during towing and the fluid needs to be changed often. Most people forget to do this maintenance.

bowtorc
11-15-2007, 06:32 AM
Your manufacturer has the real scoop. Pay attention to the recomendation and go a little sooner (like 10-20percent ). All engines are not the same, even horse power on the same block can change oil degradation rates. Injectors,rings ,pistons,liner or block hone patterns etc. all effect this. The manufacturer runs numerous test for their own knowledge and for the EPA. They like to attain the max. on mileage befors change but are also aware of what dirty oil does to reduce engine life thus warranty claims and PINS (percent of industry new sales). They have been doing this a long time and only a major mistake on their part will cause a problem. Also pay attention to the type (not brand)of oil recomended. Cheap filters can do a lot of harm also. I have seen brand new engine models come out of the test cell after only 8 hours or less and have enough carbon etc in the oil to require an oil change. These problems are monitored and corrected ASAP for the benefit of the company as well as the customer. Listen to them. Your satisfaction is what keeps them enployed. I was involved in the design, manufacture,assembly and test of diesel engines for 35 years and am very aware of what word of mouth by unsatisfied customers can do to profit.

Roger

Sundance_kid
11-16-2007, 05:45 PM
Change oil & filter every 5,000 and service tranny every year. Have 61,000 on truck. Use to change every 3,000 now retired and putting on more miles, a little pricey at $60 o pop.

tstammer
11-17-2007, 11:53 AM
I change mine @ 10,000 miles, I have had the oil tested after 10,000 and was told I could go another 10,000.

billd
11-17-2007, 03:37 PM
I do mine every 7,500 miles. In fact when I bought this truck I bought a prepaid maitenance plan for it. I pull into Ford and tell them time for service. It works out great. When I get to the end of the plan I should be ahead a little since materials and labor keep going up.

Bill

cmart
12-12-2008, 04:07 PM
My dealer told me to quit changing oil so often, its a waste of money and bad for the environment. He said wait until the light comes on telling you to change or at least once a year. I was kinda nervous about this but the military only changes the oil in their vehicles when oil samples show it time for a change, regardless of miles.

snuffy
12-12-2008, 05:22 PM
My dealer told me to quit changing oil so often, its a waste of money and bad for the environment. He said wait until the light comes on telling you to change or at least once a year. I was kinda nervous about this but the military only changes the oil in their vehicles when oil samples show it time for a change, regardless of miles.

Why would the military care since they don't pay for them like we do? I change mine every 4-5000 miles regardless and I expect it to last a really long time. My car has 356,000 miles on it and I change oil every 5000 miles. Gives me peace of mind.

Shadowchek
12-12-2008, 05:35 PM
I Change my oil at 7,000 miles using synthetic oil. The previous owner did it every 3,000 on a ford maintenance program. I think I am going to start doing it every 5'000 just to make me feel better and be sure. It isn't cheap but relatively inexpensive compared to a new truck or engine overhaul.

Greg

driver311
12-12-2008, 06:34 PM
i change my oil at 7500 mi when the computer says too. this is to keep my warranty in force.
when i get to 100000 in a couple months i will switch to synthetic.
will continue to change the filter at 7500 mi. oil will run 30000-40000 mi.
it will be oil sampled and will be changed when it gets bad.
when i change to synthetic my average mpg will increase 2-3 mpg.

driver311NoneNone

ct0218
12-12-2008, 08:51 PM
Similar to what I do, and what I have done for a little over 30 years now in every car, truck and boat I've owned. Never had an engine problem. Synthetic from one end to the other.

RnRCycloner
12-12-2008, 09:46 PM
Hi All,

I think my owners manual says 7500M (haven't looked at it in a while),
dealer likes 3000M.. I try to change 5000M, easier for me to remember..

Happy Camping

Dmaxcc6spd
12-17-2008, 03:04 PM
Anything worth doing is worth over-doing. It took me a long time to get away from the 3,000 miles rule. On my Duramax, I change oil and filter every 5,000 miles but do a filter change every 2,500. My theory is this should remove the soot captured in the filter. My oil analysis have always been good, in fact, I spoke with someone regarding my results and he couldn't believe how clean the oil was even using a K&N filter. I always use the Delco oil filter and Use Mobil Delvac1 5W-40 oil.

Considering my 2001 only has 55,000 miles on it and must last a long time, a little overkill on Oil maintenance is far chaeper than a new truck or new engine.

davelinde
12-20-2008, 09:57 PM
. On my Duramax, I change oil and filter every 5,000 miles but do a filter change every 2,500... a little overkill on Oil maintenance is far chaeper than a new truck or new engine.

wow... On my truck the normal duty schedule is 15,000 for oil and filter -- I guess I assumed the DMAX (and PSTRks) were close to the same? I change mine on the severe duty schedule which is 7500 miles, though if I have not towed a lot and have some highway miles on it I'll go a little further.

To each his own... but I assume the manufacturer knows how to write a maintenance plan and exceeding it by big factors doesn't seem worth much to me.

Since I know that I'm beating up my tranny a bit I do change out my trans fluid more often then the schedule... eg at 20,000 or so. And I do keep up with the schedule on the differentials.

Happy Campers
12-30-2008, 07:55 PM
I had a maintenance program and every 3,000 mi i took it to dodge and they changed it and filter for free.Now that program is over since i used up all the free oil changes and i still try to change every 3,000 because i tow a lot.I think my book says for towing,in traffic ,in heat ect's ect's then change every 3,000.

davelinde
12-30-2008, 08:38 PM
I think my book says for towing,in traffic ,in heat ect's ect's then change every 3,000.

I saw an interval like that for the California specific Dodge once, but my 04 has a book interval of 15,000 normal duty and 7,500 severe (eg towing).

Happy Campers
12-30-2008, 10:21 PM
My extended warranty is thru an independent company.I had the choice of taking plan a or plan b,i chose plan a.One of the differences is plan a oil changes every 3,000 mi while b is every 5,000 mi but b doesn't cover the parts that plan a does.I thought this plan was for 72/100,000 mi but looking at it tonight it is 84/100,000 mi. I still have to have a record of all other services done per manufactures specs.

redwing2
01-16-2009, 10:23 AM
15w40 Amsoil with Amsoil filter and I go 15,000 before oil change . Do an oil anal. with Blakstone labs. every other change and all is good!

jimtoo
01-17-2009, 12:54 AM
Hi redwing2,
Can you give us contact info for Blakstone labs and cost for analize?
Jim M

jbeletti
01-17-2009, 07:54 AM
Blackstone Laboratories (http://www.blackstone-labs.com/).

Cost is $22.50 to analyze an oil sample that you mail them. They send you the mailable containers for the samples and they email you a PDF of the report. You can also view your reports online.

Attached is one of my reports. As you submit more samples, the data for those appear in columns to the right of previous samples. So you get a feel for the changes over time. Then the comments they give you are more comparative.

Jim

dieselengineer
01-17-2009, 09:21 AM
Does anyone change oil based on engine run hours?

leftyf
01-17-2009, 11:17 AM
Blackstone Laboratories (http://www.blackstone-labs.com/).

Cost is $22.50 to analyze an oil sample that you mail them. They send you the mailable containers for the samples and they email you a PDF of the report. You can also view your reports online.

Attached is one of my reports. As you submit more samples, the data for those appear in columns to the right of previous samples. So you get a feel for the changes over time. Then the comments they give you are more comparative.

Jim

I'm at a loss on this one...what does all this analysis get you on a $12.00 oil change? Not trying to be a smart*ss...just trying to understand. Seems to be a lot of effort when a Penzoil place is on every corner.

And, synthetics...why? We ain't talking Kenworth here.

cdbMidland
01-17-2009, 02:12 PM
I'm at a loss on this one...what does all this analysis get you on a $12.00 oil change? Not trying to be a smart*ss...just trying to understand. Seems to be a lot of effort when a Penzoil place is on every corner.

And, synthetics...why? We ain't talking Kenworth here.

Lefty, I am going to guess that if you are getting an oil change at a neighborhood Pennzoil change place, you must be driving a small gasser. Oil changes on my diesel run over $50 each at my Dodge dealership.

I will consider the AMSOIL solution once my warranty runs out on my diesel.

nhunter
01-17-2009, 03:51 PM
Does anyone change oil based on engine run hours?
My changes usually work out to every 200hrs as I see a lot of idle time. This is about every 10,000km or 6600m. Ford reccomends 12000km or 7500m. so I figure they built the truck and the motor has warranty until 300,000km, so if they are wrong they will be replacing the motor.

leftyf
01-17-2009, 05:52 PM
Lefty, I am going to guess that if you are getting an oil change at a neighborhood Pennzoil change place, you must be driving a small gasser. Oil changes on my diesel run over $50 each at my Dodge dealership.

I will consider the AMSOIL solution once my warranty runs out on my diesel.

Nope 2008 Chevy 3/4 Duramax. Every vehicle I've ever owned was a big block chevy pickup with 3,000 mile oil changes. That's why I'm asking.

cdbMidland
01-17-2009, 10:03 PM
Nope 2008 Chevy 3/4 Duramax. Every vehicle I've ever owned was a big block chevy pickup with 3,000 mile oil changes. That's why I'm asking.

And you get your oil changed for $12 at a Pennzoil station? I can't even get my wife's Toyota Highlander that only takes four quarts changed for even close to that.

leftyf
01-18-2009, 12:40 AM
And you get your oil changed for $12 at a Pennzoil station? I can't even get my wife's Toyota Highlander that only takes four quarts changed for even close to that.

In Texas they got a lot of those drive in oil change places and they usually have a $12-$20 oil/filter/lube special. I'm cheap...I go to the car wash and get a coupon for $5 off!

Bob&Patty
01-18-2009, 02:08 PM
Lefty, your truck should have a data center in the instrument cluster. It should give the % of fuel filter, air filter, and oil change times. They will come up as % left. The owners manual should give all the info on how it all works. I dont remember if you got gas or diesel. Bob:D

leftyf
01-18-2009, 02:36 PM
Lefty, your truck should have a data center in the instrument cluster. It should give the % of fuel filter, air filter, and oil change times. They will come up as % left. The owners manual should give all the info on how it all works. I dont remember if you got gas or diesel. Bob:D

I got the duramax...guess I'm gonna have to RTFM. Didnt even know that the data center did that.

truknutt
01-18-2009, 03:13 PM
Lefty buddy,

I think the days of your $12 oil changes are history now that you have moved up to a Duramax. I read that your crankcase alone holds 10 quarts; at a veeerrrry generous $2 per quart there's $20 just in oil.

Here are the change/service intervals for the PowerStrokes.

Normal Service Intervals are defined as follows:
• 7.3L:
Oil Filter: 5,000 miles
Fuel Filter: 15,000 miles
• 6.0L:
Oil Filter: 7,500 miles
Fuel Filters: 15,000 miles
• 6.4L:
Oil Filter: 10,000 miles
Fuel Filters: 20,000 miles

Special Service Intervals are defined as follows: (ex: anytime a trailer is owed over 1,000 miles)
• 7.3L:
Oil Filter: 3,000 miles
Fuel Filter: 9,000 miles
• 6.0L:
Oil Filter: 5,000 miles, 200 engine hours or 3 months
Fuel Filters: 10,000 miles, 400 engine hours or 6 months
• 6.4L:
Oil Filter: 5,000 miles, 200 engine hours or 3 months
Fuel Filters: 10,000 miles, 400 engine hours or 6 months

This info comes from the PowerStoke Diesel website (http://www.powerstrokediesel.com/index.asp) maintenance link.

This is why so many owners think synthetics are the way to go because you can extend the oil change frequencies. AMSOIL claims up to 25,000 miles per change on the Duramax. (Link Here (http://www.motoroilinfo.com/best_synthetic_diesel_oil/chevy_gmc_duramax_best_diesel_oil.php)) That means more $$$$ in your pocket over time.

truknutt
01-18-2009, 03:42 PM
My changes usually work out to every 200hrs as I see a lot of idle time. This is about every 10,000km or 6600m. Ford reccomends 12000km or 7500m. so I figure they built the truck and the motor has warranty until 300,000km, so if they are wrong they will be replacing the motor.

nhunter,

Is there an equation or chart that you use that says "change the oil when you reach ____ hours of operation time?

The PowerStroke Diesel website (http://www.powerstrokediesel.com/index.asp?PageId=305) equates 25 miles of driving for every 1 hour of idle time as falling under the Special Service Interval.

A true story .. I was picking up one of my trucks last year from the Ford Dealer. There was a guy in Official-looking PowerStroke Diesel Mechanic's garb at the desk and on the phone with Detroit. Service writer tells me that they have a 2008 F-350 wrecker with 6.4L in the shop with only 11,000+ miles on the odometer and the motor is toast. Owner says he's only 1,000 miles over oil change interval time; Yeah, for normal Operations!

The factory tech plugged into the brain box and found out that since leaving the factory, this truck has actually operated the equivalent of 35,000 miles due to excessive idling; on the original oil!! :eek::eek:

I never heard how they remedied this little situation but I'll have to ask.:rolleyes:

TXBobcat
01-18-2009, 04:13 PM
Ford manual says to change oil (15 qts) every 7500 miles normal use and 5000 for severe use. Much of my miles are just normal use but I consider pulling my trailer I change it on the severe use. I also change my transmission oil & filter every year, which includes the oil in the converter. I also have the transaxle and differentials.

Just for my information, why would you send a sample of your oil to a lab and have them tell you it needs to be changed. You are spending about 50% of what it would be to change it out and go on..

nhunter
01-18-2009, 06:09 PM
nhunter,

Is there an equation or chart that you use that says "change the oil when you reach ____ hours of operation time?

The PowerStroke Diesel website (http://www.powerstrokediesel.com/index.asp?PageId=305) equates 25 miles of driving for every 1 hour of idle time as falling under the Special Service Interval.

A true story .. I was picking up one of my trucks last year from the Ford Dealer. There was a guy in Official-looking PowerStroke Diesel Mechanic's garb at the desk and on the phone with Detroit. Service writer tells me that they have a 2008 F-350 wrecker with 6.4L in the shop with only 11,000+ miles on the odometer and the motor is toast. Owner says he's only 1,000 miles over oil change interval time; Yeah, for normal Operations!

The factory tech plugged into the brain box and found out that since leaving the factory, this truck has actually operated the equivalent of 35,000 miles due to excessive idling; on the original oil!! :eek::eek:

I never heard how they remedied this little situation but I'll have to ask.:rolleyes:

I read it in the Powerstroke owners manual. It is in a section on stationary use for pto's and the likes.

The tech likely didn't have to plug in a box to find out the hours on the wrecker, it's right on the instrument panel. I bet in the near future warranties will be years / miles / hours. Similar to a heavy duty use motor ie Cummins, Detroit, Cat. Probably to get people like me who leave them running to avoid freezuing to death!

Duramax1
01-20-2009, 07:29 PM
I wait for the DIC to tell me that an oil change should be performed. It is GM who is warranting the engine.

I get the impression from some people that changing the oil, unrelated to engine hours, temperatures, mileage, towing loads and whatever else goes into the equation for the DIC message, is like going to Confession ie. the more times you do it, the better you feel! I guess it works for you but I would rather put some variables into the equation based on current engineering principles rather than outdated motherhood anecdotal theories.

truknutt
01-20-2009, 08:49 PM
Duramax1,

Unfortunately, not all trucks on the road have a DIC onboard to tell them when service is required (I use my dealership's Service Writer) and because there are sooooo many variables in the equation it just becomes plain easier to change at regular prescribed intervals. ;)

I have to ask; what is meant by "...outdated motherhood anecdotal theories"? I think I know what you mean but my crypto may not be sync-ing up!!! :confused:

jnbhobe
01-20-2009, 09:05 PM
I usually have about 40 cars and trucks under my control. I change the oil at 3000mi on the gas engines and 5000mi on diesels. I have never had an engine problem. Fresh oil is the cheapest maintaince I can get. JON ;) ;)

truknutt
01-20-2009, 09:16 PM
What do you do with all that waste oil? Sell it? Burn it for heat?

jnbhobe
01-20-2009, 09:30 PM
The guys at my service center have a waste oil furnace, But my oil isn't near enough to keep the garage warm in this part of the country. They do have two wood furnaces too. JON :D :D :D

Retired CPO
02-08-2009, 02:07 PM
Synthetics are the only way to go today because you can extend the oil change frequencies plus extend & protect your engine better. All I use today is below. Valvoline Premium Blue SAE 15w-40 Diesel Motor Oil, they top on the Market it cost about $75 per case of 4 gals. but it's worth it! as it is 4X better than Mobile One. Oh & I only spent 22yrs working with high temp oils in Jet engines to learn the differences.

Valvoline Premium Blue SAE 15w-40 ... (http://www.bizrate.com/rd2?t=http%3A%2F%2Fwww.amazon.com%2Fdp%2FB0011YHHK 0%2Fref%3Dasc_df_B0011YHHK0710687%3Fsmid%3DABNLWQ7 BXKBB6%26tag%3Dshopzilla_rev_1043-20%26linkCode%3Dasn&mid=184059&catId=22000100&prodId=899007074&pos=1&tokenId=8B&lg=0&bAmt=45e4b920dcffc474&ppr=5448550891c3aa42&oid=899007074&atom=10680&bidType=4&bId=17&cobrand=1&keyword=valvoline+premium+blue+sae+15w40+diesel+mo tor+oil)

Premium Blue® Extreme provides fuel economy benefits for on-highway Class-8 trucks. Statistically significant test results find up to 3% maximum improvement in fuel economy using SAE J1321/TMC RMP 1103, Type II techniques*. Testing was conducted by a leading independent laboratory.

MurrayN.
02-16-2009, 10:44 PM
I too am a big believer in Amsoil products because we use them in everything possible on our farm. From the 500 hp Cat semi to all different sizes of tractors (130 - 535 hp), from our 25 hp auger engines to all our gas or diesel vehicles, we use it in everything, and have never had anything but good luck. We have a couple of Duramax's and we only change once a year but rarely put on more than 12-13000 miles / year, and when you send in the oil sample to the lab after one year it tells you that the oil does not need to be changed.My Honda gas van gets changed once a year on about 12-14000 miles. Although if you are stretching it a bit I would recommend changing your filter every 6 months. Interesting thing happened to us. We had a no-brain hired hand for a while that thought that he knew everything, and he ran 2 tanks of straight gas through our gas weed trimmer before we caught him. The small engine shop said that the only thing that saved that motor was that we had been using Amsoil 2 cycle oil before this happened. This stuff is worth the money.

Bob&Patty
02-16-2009, 11:54 PM
To answer a question about sending in oil samples. From what I remember when I was trucking. The oil sample checks the cylinders for piston ring leakage. This indicates engine wear and how much raw fuel is in the oil. Jon might weigh in on this. My 2 cts

rumaco
10-01-2009, 06:04 PM
I rum Amzoil and have for years with a bypass system and change oil only after the lab that tests it tells me to. I am at 43,000 give or take on my present oil and going strong. Bypass is the key and filters extremely small particals.

rumaco
10-01-2009, 06:07 PM
Lefty, I am going to guess that if you are getting an oil change at a neighborhood Pennzoil change place, you must be driving a small gasser. Oil changes on my diesel run over $50 each at my Dodge dealership.

I will consider the AMSOIL solution once my warranty runs out on my diesel.

Amzoil will NOT void a warranty on engines/transmissions or rear ends! Food for thought

lwmcguir
10-02-2009, 07:01 AM
Synthetics are the only way to go today because you can extend the oil change frequencies plus extend & protect your engine better. All I use today is below. Valvoline Premium Blue SAE 15w-40 Diesel Motor Oil, they top on the Market it cost about $75 per case of 4 gals. but it's worth it! as it is 4X better than Mobile One. Oh & I only spent 22yrs working with high temp oils in Jet engines to learn the differences.

Valvoline Premium Blue SAE 15w-40 ... (http://www.bizrate.com/rd2?t=http%3A%2F%2Fwww.amazon.com%2Fdp%2FB0011YHHK 0%2Fref%3Dasc_df_B0011YHHK0710687%3Fsmid%3DABNLWQ7 BXKBB6%26tag%3Dshopzilla_rev_1043-20%26linkCode%3Dasn&mid=184059&catId=22000100&prodId=899007074&pos=1&tokenId=8B&lg=0&bAmt=45e4b920dcffc474&ppr=5448550891c3aa42&oid=899007074&atom=10680&bidType=4&bId=17&cobrand=1&keyword=valvoline+premium+blue+sae+15w40+diesel+mo tor+oil)

Premium Blue® Extreme provides fuel economy benefits for on-highway Class-8 trucks. Statistically significant test results find up to 3% maximum improvement in fuel economy using SAE J1321/TMC RMP 1103, Type II techniques*. Testing was conducted by a leading independent laboratory.
Curious how many folks with Power Strokes are using synthetic or synthetic blend oil. Ford only recommends it for lower temps. I change oil based on the hour meter. Every 200 hours which is a bit over 7500 miles some times and less other times. The power stroke injectors fire from hp oil pressure so it is important.

rumaco
10-02-2009, 08:43 AM
Well the oil companies have got us believing that we need to change oil and often. Here is my take, some from experience and some from just opinion. I have had powerstrokes since they started and have heard that 15W40 is the needed oil......pooh!!! Both my present rigs have bypass systems on them and I run 5W30HD deisel synthetic. A bypass will filter out the danger (dirt) to a .05 micron and will completeley filter 17 qts in 2 hours. Bypass means a small amount bypasses the other filter and runs through the big filter as you travel. Now 5W30 seems light but it is designed for deisels and allows faster removal of heat and gets in and out of the smaller parts quicker. I have 237,000 miles on my work puller and it has 37,000 on the present oil. I have 177,000 on my 5er puller and 43,000 on the oil. Oil itself does not break down only the additives do. I take samples every 10,000 miles and send it to a lab who will tell you everything about the engines health and I have never done an engine repair on my trucks, ever! I have never replace an injector and all pressures are as they were the day I bought them. The oil remains a brown color rather than a black color that most deisels have. Just my two cents worth.

lwmcguir
10-02-2009, 08:49 AM
Sounds like you have been there and done that. I know from experience in the Paper Mill years ago, we changed oil on a lot of the drives that ran 24/7 every year during our outage. They were old then and are still running. Keeping the oil clean has to be the primary item. I use the best filter I can buy with the teflon valves for my cars. The PSD, ( I have several) get Motocraft filters usually.

Thanks for the post. Somthing to consider and It is really good to hear you have excellent results with the lower viscosity oil.

yondering
10-02-2009, 10:26 AM
A word of caution if you have extended service insurance. Just went through this. ALWAYS keep receipts of oil changes no matter when you do it. Had a heated argument with service provider over GM issue of changing when computer said to. The ESI said every 3000 when towing, We change ours every 5000 regardless of DIC, using Rotella 15/40. ESI was satisfied when I produced receipts for every oil change since truck was new. Best wishes, God Bless ya all, Al W

PUG
10-02-2009, 12:11 PM
After researching oil wear tests on line, I have switched to Amsoil pure synthetic and use their filters. I now change once a year or 15,000 miles. In the long run it is cheaper than changing every 3,500 miles as before and the wear tests are far better. Look on the web for synthetic oil wear tests that also compare regular oil.

JohnDar
10-02-2009, 04:18 PM
Having analyzed more oil samples than I can remember, many years ago, I believe the only one benefiting from religiously changing your oil every 3000 miles is the guy pulling a camel trailer behind his "Benz.

I follow the DIC in my vehicles as to oil changes. When oil life remaining gets to the 20 - 25% range, I go for it. This info is from the OnStar site:

The GM Oil Life System is not a mileage counter. It is actually a computer-based software algorithm that determines when to change oil based on engine operating conditions. There is no actual oil condition sensor. Rather, the computer continuously monitors engine-operating conditions to determine when to change oil. Over the years, millions of test miles have been accumulated to calibrate the system for a variety of vehicles. The system was first introduced in 1988 and is now on more than 10 million GM vehicles.

PandBStandiford
10-05-2009, 10:20 AM
The owners manual for my 2001 Ford says to change the oil at a 3000 mile interval if used in severe duty environment, short trips, and specifically if you tow a trailer for more than 1000 of those miles. I change mine at 3000 mile intervals because of the towing and environment where I live.

Dennis
Just got 2008 F350 with 6.4L PowerStroke. I popped in the DVD that was in the console and began watching the recommended maintenance. Under normal operating conditions, the recommended oil change interval is 10,000 miles.
This drops to 5,000 miles under dusty conditions, towing (more than 1,000 miles), operating below a certain temperature and excessive idling of the engine.

palebluedot
10-05-2009, 12:11 PM
In October 2005 (right after hurricane Katrina) I talked to a guy at a local truck stop that was pulling a FEMA trailer to Purvis, MS. He had a 1995 (12 valve) Dodge Cummins that he normally contracted towing rv's from Indiana to dealers all across the country. He had just turned 900K miles on the truck so naturally I had to ask a few questions. He bought the truck new and always changed the engine oil every 10K miles and used Shell Rotella T 15W40. Valve adjustment every 100K miles other than that never a wrench on the engine, 2 rebuilt transmissions and 1 rear end.

JWG
10-07-2009, 08:57 PM
I did at one time follow the DIC, but now I change my oil about every 4, 000 to 5,000 miles just to be on the safe side - filter too... Swaped out my K & N for an ACDelco high volumn air filter... I came across an independant lab test that compared several brands. It showed the AC actually outperformed all of them including the K & N... More air flow, more filtration... Go figure... I guess air filters are getting better too...

NewCyclone
10-18-2009, 12:59 PM
Swithing to AMSOIL will not void your warranty!

With AMSOIL and oil sampling you are not only saving yourself money but also helping the environment.

Elder1
10-26-2009, 04:06 PM
well just to add my 2 cts worth, my owners manual says 7500 miles but like many here I change every 5000 miles, its a nice easy number to remember and its cheep compared to a rebuild

lwmcguir
10-26-2009, 06:56 PM
I use the hour meter and change at 200 hours. That way it takes in the idle time. We change the oil on our large farm tractors at 200 hours as well. Only difference is they run at full throttle most of the time on the hour meter. Keeping the air clean on a Diesel is just as important as the oil and filter.