My MMO story FWIW: I had a 300 ci ford 6 cyl that was converted to propane when new. Everyone that knows the motor know they are bulletproof. By 30,000 the top end was gone in it. The propane provided no lube to the valve/seats/guides. Had the head rebuilt and a topend oiler installed, think MMO even made the oiler? I still have it so I'll check. Anyway it just used vacume to pull an adjustable metere amount of oil into the engine. Can't remember the exact usage but it isn't much at all. That motor has run a bizillion more miles, been idled over night and it's still strong. So MMO must do something? Coolest thing about propane was the oil dumps out looking the same as it went in, it was tough to throw it out LOL. Plugs? never changed them. I also use MMO as a fluid to cc motors, if I don't all of it out or some leaks below the piston, no worries. Even with everything covered with it the engine (twostrokes) always start and never foul the plug. In some case they actually start and run smoother for a few seconds, LOL. smoke is sweet smelling too! Some bikes that use a downdraft style carbs, the slide lays on its side and I always saw wear on the slide. Started throwing a capfull of MMO in the fuel from time to time. Even with the small amount used, I would find the slides were much better, and could detect a very slight mint smell on my gas covered hands. Someone told me the mint oil whatever it is, IS NOT on the msds because its not hazardous. Not sure if that's true? Mother nature has some pretty kick butt lubes though.