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Hi,
Oil is one of those things where Better is really only better if you have the need, or can actually use the advantage(s), one oil has over another.
For a Street driven Boxster, Mobil 1 is more than adequate. Is it as good as Royal Purple, Red Line or Amsoil? There can be measurable differences in the Lab, which are either not present in real life, or unnecessary.
If a car engine can go 300k mi. on Red Line without excessive wear, using Mobil may be just as good for 298k mi. with the same result. But, if the Red Line (or other premium brands) cost 10%-20% more than Mobil 1, then there is probably no positive cost/benefit to using it.
If you're racing the car, the premium oils may have advantages which you will actually realize, such as high-temp performance and such. But, again, in a street car, you'll probably never need, or realize, these advantages.
The one thing to realize is that you're never going to hurt the car using Mobil 1, it's a very good Oil. And, you probably won't forestall any breakdown or reduce repair costs when using any of the premiums over Mobil 1 either, it'll just cost you more.
The key is proper change intervals, and from all the research, this appears to be between 7500 and 10k mi. Porsche says longer, but their interval was established as much with Marketing in mind as actual testing. Also, the Porsche interval is qualified to be under ideal driving conditions which almost no one encounters. Your region's avg. temps, the environment in your area (such as Dusty - anyone regularly using the Expressway falls into this category), and your driving style can all reduce the recommended change interval. Hope this helps...
Happy Motoring!... Jim'99
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