only had luck with it cleaning gummed up carbs,on my dads boats, and it has free'd up the occasional stuck oil control ring I'm sure, but its not a miracle cure
Really good for cleaning gunky parts. I put some in the crankcase and let it get warm before I change the oil on something I think may be nasty inside. Dont put it in your fuel system to burn in the engine. Its formulation is in a mineral oil carrier. Meaning it is mostly mineral oil.
