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Mobil 1vtwin 20-50w in engine, mobil i synthetic gear lube 75-90w for primary and tranny.... it's quiet, has a lower temp, and provides great protection IMO.
Mobil 1 20W/50 Vtwin in engine and primary and Mobil 1 90/140 in trans.
Just changed to Mobil 1 15W/50 in engine since getting cooler here in NH. Also trying Mobil 1 75W/90 in trans for same reason. Still have 20W/50 in primary.