[thstone]

Previous poster was correct - Porsche schedule calls for 15,000 mile intervals.

Mobil 1 10W-40 High Mileage every 3K miles or 4-6 track days, which ever comes first (usually the track days comes first because my daily commute is pretty short).

Might be overkill but the engine gets a real workout on the track and there's not much else to be done to help engine longevity and reliability.