| I believe 15/40 is recommended, unsure if you can run different grades with synthetic.
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07.5 GMC 2WD C/C SB LMM duramax: Ready-lift leveling kit, 20" wheel and tires, MBRP 4" filter-back exhaust, S&B intake system, Westin Nerf bars, and billet grill. ECM (from SoCal diesel) with DPF delete and 100 hp EFI Live tune. |