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COMPRESSION TEST 850

You definitely have some worn or stuck rings for the compression to increase 50% like you described. Looks like the engine wasn't maintained very well before you bought the car. If it's gummed up the treatment may help but don't expect anything to happen quickly. Additives are designed to clean gradually so that the oil passages don't get blocked it may take thousands of miles of driving to see a difference. Getting the rings replaced would be very expensive.






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