I had different problems with the MT Transmission oil. First used 75W-90 from Fuchs (don't know if that is availabale in the US). In the end i ended up with Shell Spirax 75W-90 which is the OEM oil that Posche uses. This is very hard to get in germany, because they only sell 20 and 209 litre barrels. Maybe it is easier to get in the US in 1 litre.
If have a LSD you'll need another oil.
Regards
Markus
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