RE: Marvel Mystery Oil?
I can't tell you that Marvel Mystery oil is good or bad to use as after run. The one thing I can tell you is that my first and last experience with this product was about 10 years ago when I thought I was doing A good thing with A OS108 motor that I wasn't going to use for a while. I fully lubricated the intake and exhaust ports with the Marvel oil, then put it in a plastic vacuum sealed bag. A year later when I opened the seal to use the motor I found a rusted solid frozen piston, the engine was completely seized up and useless. For what it's worth. jmpups