| diesels of 20yrs. straight 30 is what was used primary, but then engines cranked hard in the winter below 30F so, you changed to thinner oil in the winter month's. Seems like it was sae 20 wt. So hence multi-weight was developed(15w-40).
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2005 LLY CC/SB 4x4/Allison, PPE Xcelerator, MBRP 4" turbo back, AEM workhorse intake,Outerwears prefilter, EGR blocker plate,Autometer pyro and boost, Westin W2W steps,Delta crossover box,Bilestein shocks,Energy Suspension sway bar bushings, Odyssey dry cell batterys, odc diff. cover,deep tranny pan |