Who on the forum has the highest mileage 987.1? Any engine mods to attribute to the longevity, or just stock? I have 65,000 on my CS and have the motorsports AOS and the Mantis Sport 1.5 quart deep sump. I change the oil every 5,000 miles for the past 50,000 and prior to that it was every 7,500. I use Mobil1 turbo diesel blend 5w/40. No known mechanical problems to date and I drive it hard at times and frequently to redline (7,000 RPM's).