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Old 10-13-2007, 07:22 AM   #34
sreigle
Montana Master
 
Join Date: Nov 2002
Location: Oceanside
Posts: 20,028
M.O.C. #20
I have never put additives in the diesel in any of mine. But I've never put more than 85,000 on any of the trucks so I don't know if longevity was affected or not.

One question I always have when looking at additives is what is the payback? If it increases mileage, does it increase it enough to offset the cost of the additive and the hassle of storing it and adding it to the tank? If it adds to longevity, does it really do that? How would one know? Will I own the truck long enough to find out? Etc. Etc.
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