[peterbrown77]

Originally Posted by JFP in PA

First of all, a lot of people have tried a a lot of different gear oils in these cars, and most "after market" gear oils cause shifting issues like you mentioned and noise issues; all of which go away when the car is swithced back to the Porsche gear oil. Do a search, see for your self......

I've been using Mobil 1 since it came out in any application I can find. This spring I changed the oil in my 6-speed (what drained out looked terrible) and gave it a clean fill of Mobil 1. Shifts like a ******************** until I have driven it for 15 minutes; should have used the Porsche lube. I'll switch it out when I have some time and feel like pulling off that damn aluminum plate again. Couldn't Porsche have drilled a hole in it so you can get at the drain plug without undoing half the suspension?