Thanks....it is hard to come by, and was told by the guy at a local truck stop that 15w-40 would work OK, but I did some of the reading you referred me to, and actually pulled out the Detroit Diesel Operator's handbook, and it specifically says to use 40wt, and to only use 15w-40 in below freezing conditions. I found an online site and ordered 10 gallons of Rotella T 40wt.......
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