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OK WHN, I like your thinking, as I use MMO in all my classics, and I use cornhead grease also, the only difference is I am using 15w40 diesel oil and STP instead of 20w50. I was concerned that on startup that 20w50 with STP, would be so thick that it would not flow down to the mains fast enough. But I guess it works ok huh? I used 140 weight gear oil with about 40 % STP in the transmission, and just 140 in the differential.