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The engine is a factory warranty replacement. Who knows where it was installed. You might have to track where it was originally sold and follow from there. (Carfax??) The factory replacements for the M96 996's had the M97 997 style non-serviceable' IMS bearing. That means you cannot replace it without a full engine teardown. The good news is that the bearing has a better track record (lower failure rate) than the previous single row bearing.
So what to do...? Drive the car, use good oil and change frequently (3000k), install an oil filter adapter for the spin on filter.
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Tony G
10 Porsches come & gone!
1962 Morgan Plus 4 
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