Fuelman, the downside is how many engines have been ruined because the guy gets his new GotAHaveIt ready to run souped up RC car and tries to lean it out and drag race his buddy down the street on the first tank. For him, a couple of tanks slobbering rich, even if it stays a little cool might be the right thing to do. That said, I totally agree that its a heat thing and that you must have heat in the engine to break it in correctly, just not scorching hot.

Ed M.