I started out with 1 push on breather and a PCV valve, went out and thrashed the car and popped off the breather and lost it. I then went to a K&N style breather and a PCV valve and the breather would stay on but I had a small rear main leak, only when I thrashed it and the breather would be oil soaked. I then added baffle plates inside the valve covers, got rid of the PCV valve and added another K&N breather and no more rear main leak and no more oil soaked breathers.