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For the simple reason that Porsche AG and Mobil Inc have a commercial agreement....
If Castrol or AN Other oil company put in the lowest bid next time Porsche went to tender for the supply of lubricants, then the recommended oil would be Castrol or AN Other and Mobil would be soon forgotten.
It wasn't very long ago that Porsche AG had a commercial agreement with Shell ND to supply all their lubricants - just look for the Shell logo in the engine compartment of the air cooled cars.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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