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Mobil 1 in 0-40 appears to be Porsche's preferred oil in newer cars.
JT,
I agree, it seems difficult to go 15k miles with an oil change. However, synthetic oils are a bit different.
Conventional oils, are derrived from crude oil, are predominately hydrocarbon chemicals with a few additives. They have unique chemical properties, mainly their ability to lubriacte and their ability to remove heat (cooling affect). Disadvantges of natural oils (may be a bad term to use, but hell, I am going to use it!) are they tend to chemical breakdown over time (I.e., mialege in your car) and they contain a few contaminates, mainly produced during their extraction from crude-oil. The major concern, especially after some time and heat (the milage issue again) is they loose their ability to lubricate and their ability to remove heat (cool your sweet engine!). If you have ever noticed, old oil, is dark, gritty (contaminants in the oil, stuff (wear metals (yuk) from your engine, and dirt): This means it is time to change it!!!
Along comes the synthetics: They are still chemicals, predominately derrrived from other chemicals, and may actually have their roots from crude (but much more remotely then "natural" oils). Their added advantages are they are made by geeks (chemists, yes I am one by training, many years ago) whom have developed unique properties of their soups including better viscosity control, fewer nasty by-products (sulfur containing compounds for example), better heat adsorbing properties (cooling of your engine), and better lubrication properties. If you notice, the color of the synthetic, remains closer to its original amber color, much longer then natural oils. This is a sign that it is still ok. When it starts to change color -- change it!!
The stuff really works and yes, one can go many miles beyound the old 3000-4000 mile rule.
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