I didn't have 4 jack stands (only 2 and 2 ramps) so I installed the old fill plug, dropped the car, drove it up and down the street twice, re-lifted and was able to get just under 200ml more in. I can't imagine you'd want a significant amount more in as the total fill is only supposed to be 0.6L correct?

 

Sounds about right.

 

Just got transfer case fluid change at dealership in the past weekend. They charged $375 for the oil and labor, $270 for the temperature sensor.

 

I feel the same way! It seems like finding anyone on the other side of the counter in any industry who can think without having to ask someone else is non exsistant these days. Anyway, my question is this: the gear oil in the t case is synthetic 75w-90 gear oil. What make the German brand name oil worth $75 a quart vs. any run of the mill gear oil from any auto parts store. (for context I was a professional mechanic for 40 years) Limited slip differentials are nothing new so when I felt the shuddering in my '16 cayenne I knew what it was right away. But I didn't know it was in the t case, I thought front diff becausewe first noticed it while backing out of a parking space. When it did it under load up a hill I started getting neveous. I changed the oil using Valvoline synthetic 75w90 and the problem is gone so far. Do you have any experience using friction additives with more readily available oil?
I understand that Porsche has this extended warranty where this problem gets you an additional 7 years of coverage and it's transferable! That awesome! Mine missed the window, it expired a year ago and the problem just started. I am the second owner, we've only owned this car a year.