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I did another compression test on my old Jeep today. I have put maybe 75 miles on it since I checked it last week. Cyl 5 had read 95 PSI before I put the Marvel oil in the plug hole, Today it read 135!!! Quite an improvement. This stuff seems to do the job. I know this is not a Porsche but it may be of some use in our old 928's.
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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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