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Porsche recommends using Mobile 1 oil, specifically 0W-40.
Mobil 1
Porsche recommends Mobil 1 Synthetic 0w-40.
Mobil One 0w-40
Porsche recommends the use of Mobil 1 synthetic 0-40 weight.
The 2003 911 C4S takes about 9L of Ow40.
A 2004 Grand Prix GT will require approximately 5 quarts of oil. The type of oil required is 5 W 30.
A 2001 Porsche 911 2 Carrera requires 9 quarts/8.5 liters of oil without a oil filter change. Including an oil filter change it will require 9.3 quarts/8.7 liters.
Mobil 1
mobil 1 - OW-40.
I would use Mobil 1 synthetic 5w40. It seems to work the best for me.
No. Conventional oil is acceptable.