You might be able to see if exhaust backpressure is the problem (or part of the problem) by removing the test port nut on the cat (should be just in front of the cat) and driving the car in the manner that would normally cause it to lose oil.
Caveat: I can't remember the exact position of the test port... I think it's far enough under the car that the exhaust would stay underneath, rather than come in the engine bay... if you take a look, I'm sure you'll be able to tell if it's a dumb idea.
- Brian
|