RE: Marvel Mystery Oil?
This guy at an LHS told me not to use marvel mystery oil in my engines as this will glue the piston to the sleeve. It turns out that this guy and his dad created an after run oil and that they are still getting paid for it. I used to use a 50 50 mix of atf and mm and this worked great but someone told me to use the MM Airtool oil which I use now. The only thing I've noticed is when you start your engine for first time it smokes allot. Michael