one of the best after run oils is............remenington spray gun oil. avail at wal mart. shoot it right in the card. not to much, just a squirt does it. other oils are too thick and coagulate in the glow plug. four stroke owners just put a squart in the breather tube at the bottom and flip her over a few times. nitro doesn't corrode, it's the moisture that the methonal draws that can rust bearings etc.........RON