you will get different anwsers about the bearing in a rb. I had a similar problem. I have a s7 l2g. Mine did the same thing, about a gallon the front bearing leaked badly. I changed it with a tko ceramic. But it still leaks a little. I have heard from some that if the front bearing is leaking the bottom is to rich. If your engine is a l2g type it is going to run a little hotter due to the low head