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Originally Posted by ammolab Why a "motorcycle" oil? You have no wet clutch...and plenty of autos have gears driving oil pumps, camshafts etc. lubed by the crack case oil. I can't think any crancase oil is going to have a GL rating....and no Gear Lube is going to be good for engine use. I say...

I'm looking for an engine oil, that carries a GL4 or 5 rating? If such a thing exists? It's for the engine in my airplane that shares oil with the reduction drive (gearbox). I emailed AMSOIL and asked if any of their motorcycle oil met that GL rating, and after several emails the rep never...