Oh yes, forgot about that test, but unfortunately I do not have the leak-down test tool. I had one but my son likes to go shopping for tools in my garage. :ROFL: He sees what he likes and all of a sudden the tool grows a pair of legs and moves out...into his garage or tool box. I'll have to pick up another test gauge.Sounds like you are talking about a compression test. Leakdown tests are only done dry and involve a leakdown tester. if excessive then you listen at the oil fill, exhaust or intake for air escaping and that tells you where your problem lies. As far as I am concerned a leakdown test is much more accurate and telling than a compression test.