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Dr U said:
I am going to change the oil more frequently than recommended.
Read the web's technical articles on Mobil 1 and other synthetics: you may then think and act differently.
From what I can understand, a "feature" of synthetics, but apparently true of all forms of motor oil, is that the "friction reduction factor," which you obviously want to be maximized, actually seems to improve - up to a point - AFTER the first few thousand miles. The point of maximum friction reduction seems to vary by oil type and brand, and perhaps by vehicle type and kind of driving, but the maximum point of friction reduction takes a while to reach; there's lots of variables. The main point being that it's counterproductive to change oil too soon.
Since Porsche recommends Mobil 1, and to change it at a specified mileage/time, I'd stick with Porsche's recommendation; you may save more than just your money!