To determine whether the rings or valves are at fault, squirt the equivalent of a spoonful of heavy oil into the combustion chamber. Crank the engine to distribute the oil.
Repeat the compression test. The oil will temporarily seal the leakage past rings. If the comp. remains the same the rings are okay but the valves are leaking. If the comp. increases substantially there is leakage past the rings.
Good luck,
Joe
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Joe DV
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