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  1. tickerguy

    75w90 or 75w140?

    Yeah, I know there are others who have commented on this, but let's put forward the scenario and see what people think. 2002 1500 Suburban, 5.3L, standard G80 roller locker. Used mostly/almost always for hauling or towing; boats historically, last four-five years including a cargo/RV trailer up...
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