Tranny fluid: Redline versus Royal Purple
 

I replaced the tranny fluid in my 00 Carerra 2 a few thousand miles ago with Redline synthetic and noticed an improvement in shifting feel. I decided to swap fluids again (chasing a whine in tranny) and this time used Royal Purple and noticed another improvement in shifting feel.

I wouldnt have expected this given that both are synthetics and have good reps. But, good to know for anyone thinking of swapping.

Did it help the whine?

It did not help whine-not sure if its "normal" or not.

Do you know how often Porsche recommends changing the tranny fluid?