| You really need all the plugs out so you can keep the engine cranking speed up. I don't put oil on my compression tester o-ring. BUT, I really like that idea so next time I do a compression test for fun I will do that. :-) Definite possibility of a head gasket problem. Were those two plugs fouled badly on #4 and #6? A leakdown test would help you further identify if the driver side head gasket is gone. Several years ago I had similar compression numbers and there was a head gasket problem on the drivers side.
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