don't laugh - marvel mystery oil
its just hydraulic fluid, nothing mysterious about it,
but I pour about 6 ounces in per tank, (keep a couple of bottles with 6oz each in the trunk by the jack, wrapped in old RD350 innertubes so they dont rattle too much) and I swear I get a slightly slight smoother running engine, plus 1+ more MPG.
I like the idea of pre-mix. My RD350 does not have any oil in its crankcase, it runs on premix (well it has a pump that dribbles it into the intake manifold) and thats all it needs for rings and bearings, so I got thinking, why wouldn't a little lube in my upper cylinders help out a bit.
Also, supposed to help keep valves free of built up gunk.
Call me old fashioned.
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