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Old 07-22-2007, 12:03 AM   #2
gmcracing92
Drillin oil on American Soil!
 
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Join Date: Apr 2005
Location: Minot. North Dakota
Posts: 418
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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Last edited by gmcracing92; 07-22-2007 at 07:31 PM.
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