[jmatta]

No offense, but I'd like to know the dollar value exchanged between Porsche and ExxonMobil for the "exclusive" fill sticker. If you trust a Porsche engineer, then you also trust the accountant that made him trim the parts back to save a few Euros on each car.

I've read enough independent study (as well as track experience) to know that changing your oil often can be critical to engine life. The high mileage guys will tell you the same thing, with out getting into which oil is better. I know the brands I prefer and M1 is not one of them, nor would I ever recommend it to a friend.