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Long before I would get out the stethoscope, I would be reaching for my oil pressure test kit that uses a tested mechanical gauge to tell me what the oil pressure is doing when the noise occurs.
It could be something as simple as the $20 oil pump piston and spring update kit that Porsche released some years back to address low oil pressure at idle on these cars; or it could be something more complicated that requires further investigation before the noise becomes constant..........
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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