Sadly, this engine alloy issue is not confined to Porsche. BMW has a MASSIVE problem with their V8 engines between 95-98. They VERY QUIETLY replaced a ton of these engines.
In my experience, the Porsche engine is very tough indeed, putting aside the issues we already discussed. Recommendation I make to all my customers:
Change the oil/filter every 7500 miles, not 15K like the manual recs.
Use 15-50 Mobil 1 in warmer climes.
DON'T hammer the car when it is cold. NO engine likes this.
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