The one peice seal has help a lot. We check this on the dyno when we run the engines and we have some guys that call with a leak and we did not have it on the dyno. I have some guys over fill the
oil pan, have a problem with the
oil line at the front and it run back along with a few other things. I always try to
oil dye the engine in the car if I have a leak to see if I can find where it is leaking for sure. I have evn had the transmissions leak and run out the bell housing a fool you. Good luck, Keith