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Need to distinguish between a 'leaky' lifter - it pumps up with full oil pressure after a few minutes - and one where the tappet has been 'hammered' into the bucket an never frees up.
The manufacturer INA has changed the part number several times, So has Porsche. So if you do replace, be sure you read the old threads on this well worn subject and get the latest part number. A full set may cost $700++ just in parts
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