The supercharger that I am using does not have an oil line connected to the crankcase. It has a self contained oil bath in back and front of the supercharger case. The engine is a brand new GM crate motor with about 4000 miles on it. If I was getting pressure blowing by the rings then wouldn't I find oil leaking from timing chain cover, oil pan and other areas. I am only running 6 psi of boost at the most. I will do the compression test to eliminate that possibility.