svd said:
I don't think high sulphur will damage engines built after 1/1/07, but it will poison exhaust after treatment systems (catalyst).
True, it doesn't damage the engine, but it will clog (ruin), and disable, the new particulate filter. When that happens the engine shuts down, and you go nowhere. That soot filter is quite expensive to replace, I understand it adds over $1000 to the price of the new trucks. When soot builds up to a certain level the exhaust cleans itself by very high heat generation. The same principle when unleaded fuel first appeared, and some people put regular leaded gas in their cars, and the catalytic converter died.
As far as the offroad diesel not being as fresh as regular diesel, I posed the question to the station I fuel at. I was told that they get a tanker weekly of regular diesel. Offroad is topped off periodically, but she said that they use less than a tank full over a 2 month period, and its a smaller tank. I would guess that in a farming area the fuel may be somewhat fresher, but out of those areas it may well be older.