I did the TEST today and my 4k failed miserably. The dipstick didn't even make it stumble and the oil filler cap barely made the engine slow down. So the million $$ question is, how do I find the leak? Thanks for the help. Pat Martin 864000csq 2 1/2 cat back, H&R-Boge,advanced and loving it. Drilled and stopping it. Koenig Cobra 16x7 with AVS Intermediates, K&N. 95 subaru legacy Bothell, Wa.