The leakdown tester is less common, and you need to get a good one to do the test properly. A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ...

If your car is getting older or you feel like you may be losing some engine power, a compression tester can help sort out the problem.

Compression testing is another good tool to use when diagnosing an engine. Combining the results of a leak down test with a cranking compression test can indicate an engine's potential.