Should I change my transmission oil?

[JFP in PA]

Originally Posted by PeterBleakney

Thanks fellas. I will change the trans oil. I noticed someone on the forum used Red Line 57904 (75W90) Synthetic Gear Oil. Thoughts?

None that are any good. Porsche used a full synthetic gear oil that was made to their unique specs in these transmissions. Over the years, I have lost count of how many times we have had cars come in with complaints of transmission noise, poor shifting, etc., all of which went away when we dumped whatever was in the trans and put in the factory oil. Yes, it is pricey, but does an excellent job and is long lived, and does not cause any problems.

Choice is yours..............

[ty_wheels]

JFP - do you know what is the recommendation of Porsche for changing the transmission oil (miles / years) ?

[pilot4fn]

Originally Posted by JFP in PA

None that are any good. Porsche used a full synthetic gear oil that was made to their unique specs in these transmissions. Over the years, I have lost count of how many times we have had cars come in with complaints of transmission noise, poor shifting, etc., all of which went away when we dumped whatever was in the trans and put in the factory oil. Yes, it is pricey, but does an excellent job and is long lived, and does not cause any problems.

Choice is yours..............

Is the best option just to buy the transmission oil from the local Porsche dealer or will one of these do: 999 917 546 00 (Shell) Shell Transaxle (75W-90) or Mobil Mobilube PTX (75W-90)?

[JFP in PA]

Originally Posted by pilot4fn

Is the best option just to buy the transmission oil from the local Porsche dealer or will one of these do: 999 917 546 00 (Shell) Shell Transaxle (75W-90) or Mobil Mobilube PTX (75W-90)?

We always purchased ours directly from a dealer, that way there was no mistaking what we were using.

[PeterBleakney]

Thanks JFP. I will get the real stuff from by nearby Porsche dealer.

[pilot4fn]

Originally Posted by JFP in PA

We always purchased ours directly from a dealer, that way there was no mistaking what we were using.

Thank you, I'll visit at the dealer for the oil