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One way to free up stuck rings is to put a few Oz., of Marvel Mystery Oil into each cylinder through the plug holes. Let it sit a few days, then turn the motor over with plugs out to blow out any extra oil. Also put the Marvel into the crank case, maybe a quart in with the regular oil. I would first do a compression test before anything, write down your readings. After doing the Mystery Oil take another compression test to see if any readings changed.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L. Latest addition: 2000 BMW Z3 Roadster
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