I may have to try that. I've had oil on these things for ever. Tonight I even cleaned all the rust off and scraped the top clean next to the cylinder wall. I took a 2x3 (cut a 2x4) and hit every cylinder with a sledge hammer until my arm hurt (remember, I really don't care about this motor). I only used one arm but I was hitting it pretty good. I guess the oil pan is coming off this week/weekend.