How about I grew up 15min from Mobil 1 headquarters and know for a fact that they buy the rights?  (since 84) I agree Porsche does send out a "min. requirements" sheet to the manufacturers, but that doesn't mean the oil we bought from Mobil1 for a 97 Boxster is the same oil we get now. Matter of fact, we know it is different.
I'm the first person on the planet to point out armchair engineering  but I also know how this works. Money talks.
2 out of the last 3 Factory Porsche backed ALMS teams I have worked with since 99 have been sponsored by Mobil1. NONE of the engines had Mobil1 in them.
Those people I know from Mobil1? ChemE's who actually help develop the formula's. They also test all the other brands to see what the next guy is doing.
I used Mobil1 up until I found out who PMNA uses for oil analyzing and started having my oil analyzed. Big difference between the different oils. Pick your poison.
B
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