Originally Posted by
utc15
No, but....
My experience is, after a garage replaced my flame trap, I switched to full synthetic. 2 years later, the throttle actuator was fouled with oil and went into limp mode due to a clogged port between flame trap and the oil pan. So, I believe if there is crud build up in your oil system, synthetic may loosen it up and clog flame trap, pressurize crank case and create leaks from front or rear seals.
Your issue sounds like it has more to do with poor service than synthetic oil.
That port should have been cleaned when the flame trap was replaced the first time. It gets clogged with carbon as the result of oil vapor moving through it, but it takes a long time. That port took over 150,000 miles to get clogged up on my cars (it was still clean at 75,000 on the 2001 T5, for example).
If yours clogged up in two years, it's because it wasn't cleaned when the PCV work was first done. It's easy to overlook, hard to do properly, and because vapor is moving through it, not liquid oil, no gunk from the engine is being added, so a good oil (synthetic) will prevent it clogging, not add to the clogging.
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