Watch you attitude, Jim! You have a tendency to overreact when anyone considers a different opinion than yours.
I simply stated that I had never seen this happen and that I have never seen any credible evidence that it occurs. To my mind, I still haven't.
Since this car is manufactured by Porsche and they recommend the synthetic, I would tend to go with it and that is simply my opinion. The poster is free to do whatever you advise him to do, if that is his wish. Since he does not know for certain what oil is in the car, I see little risk going with a superior synthetic motor oil.
What is his alternative, to guess what is in there and try to match it? Fact is, it is almost certain whatever he puts in the car now will NOT match what is in there. So what does he have to lose?
To me, the changing of different oils equals leaking seals theory is just that, a theory.
Or as you termed it, a wive's tale.
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