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Re: 07 GMC 3500 Classic-Durmax
our company uses dino oil til 20k, then we switch to 5w40 mobil 1 synthetic. thats with the cummins diesel.
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Travis
70 Chevy c20 2wd
75 Chevy k10 4x4 parts truck
92 GMC Sierra c1500 2wd DD
99 Chevy Reg Cab Sht Box 1500 2wd
05 GMC Sierra Denali white
Last edited by gmcracing92; 07-22-2007 at 07:31 PM.
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