Diesel Kleen

FWIW, if there's a Meijers supermarket near you and you've been buying your Diesel Kleen at WalMart, it's a $1.20 cheaper at Meijers in the quart bottle size. I didn't see gallon jugs of it there, however.

I prefer AMSOIL Diesel Concentrate and then in the Winter I use the Diesel Concentrate Plus Cold Flow Improver. Both have done a great job in making my engine run smoother and seemed to gain a little MPG out of it as well.

I use "Opti-Lube". I read the reports and have been happy with performance thus far. I was using Diesel Kleen and didn't really notice much improvement, thus the switch.