The 75W will flow better at cold temperatures. If you don't live in a cold climate, it shouldn't be a problem for you. Usually the 75W is the synthetic version if the maker has both syn and conventional varieties, because synthetics have a more stable viscosity over temperature changes. (Higher viscosity index)
_________________ 05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar, RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.
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