Methanol is an alcohol and yes alcohol wash's down the cylinders and works it way down into the oil. Go to the track and walk around the pits. Watch an alcohol car drain the oil it will look like milk, thats the alcohol washin down the cylinders. But your talking about spraying it into the intake at a very fine mist plus you probably wont use pure 100% meth it will be some sort of mix. So keep up with regular oil changes and your good to go.