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 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.
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