Lydo, I believe the most critical point is running the engine dry after use. There is oil in your fuel and the fact this oil is so difficult to remove from your model when spuewed from the exhaust, gives testiment to the tenatious sticking/coating abilities of this lubricant. For me personally, I will continue to use an After Run Oil, as I know it doesn't hurt and it gives me a sense of security. However, you can trust the guys whom state they don't use it to have valid opinions, also.