I'm not sure it was talked about in the forums before but what is the down side of using racing oil in our track cars?
I have a prefix 9L with dry sump and it's mostly a track car!
I use AMSOIL Dominator 15w50. Runs great and it also has some Calcium in it which is a detergent. I need the extra anti wear additives that race oil provides, to get more life of the engine.

Do I need to switch back to a street oil from time to time? just to make sure it cleans the engine better? Or I could get away with engine flush products every time I do an oil change? Does anyone with a built motor run a street oil in their track car? and Why?