One of my clients used cheap vegetable cooking oil in his high performance 2 stroke jet ski for all the years he had it. The ski went unreal & just kept going. Then there's Glenn Kearney's story of while overseas racing an ISDE for Husaberg, holed an engine case & lost all the oil. They patched the case but the small European town they were in had no synthetic 4 stroke oil, so he too used cheap vegetable cooking oil (all he could get), got him through the days until they got the "correct oil". Hence the nickname "Chips Kearney". Oils aint oils, or so it seems.
K