as you all know ian very big about marvel mystery oil. BUT today i was at the MMO site. and they said that MMO does NOT mix with methanol. they said do NOT put it in racing methanol. i have not checked this out. my guess is you can still use it to lube engine parts, till the castor oil gets to the parts. but still use MMO in your street engine. 4 oz to 10 gal gas.