Thanks for all the info. It's great reading. I'll tell you what I told this Porsche owner, an 07 911. Use an oil on the list. Get a couple of uoa's to establish how the oil is doing. Develop an oil change interval based on results. Threat the uoa as an evaluation of the oil, not necessarily an evaluation of the engine. His questions came from the fact that he drives an older Porsche in Porsche club racing (a great program) and many racers treat Mobil 1 products like the plague. Based on our work on the engine and lots of analysis over several years with this customer we use Red Line engine oil and gear lubes.
Many Porsche cars life a different life. I know of several owners that baby the cars and treat them like a precious swiss watch that never gets over wound. And I have some friends that have newer models and treat them like a mad dog and whip them every time they drive them. One guy bought a brand new 911 Turbo, took it home, dumped the factory fill added Red Line and with his wife took off on a 7k mile trip to as he stated "break the car in". On the trip he changed the oil once and his response is that his warranty is not at risk because he has never seen a Porsche engine failure due to engine oil. No flames, it's his statement not mine and I don't know enough to comment. By the way this is his 11th new Porsche in 20 years and he has 5 vintage Porsche's in the garage and a Porsche Cup racer, too. By the way I have driven that car and I can see why he really like this car. The moment I got on to the highway I too had the feeling that I needed to go on a 7k mile trip.
