Compression Test Help

[fbdewar]

Okay so my cylinder compression in one cylinder is slowly leaking down on a compression test. I don't have a leak down tester currently but I'm wondering if I add a teaspoon of oil will this help me diagnose whether it's the rings or not with a compression tester or will the pressure still slowly drop even if it's a wet test?

 

[someonesomewhere]

Adding the oil will help determine if it's rings (compression goes up) or valves/cracked head (no change). Ultimately it will still leak, but should help point you in a direction.

 

[sloinker]

It should slowly leak down on all the cylinders. If one is leaking significantly faster than the others....What are the pressures and how far apart are they? What does the manual say for allowable tolerances?