Redline gearbox (transmission) oil

[nos4a2]

I am going to change the gearbox oil in my new (to me) 996 Carrera soon. I know that the recommended oil is SAE 75W-90 Mobil (Mobilube PTX) or Shell (Transaxle) - thanks Richard for the superb technical article - but I was wondering if anyone had tried any other brands?

The car has done 91,000 miles and the change to 4th is getting a bit notchy. I am currently using Redine (Red Line?) gearbox oil in my track day E30 M3. There was a noticeable improvement in gearshift quality from cold and a reduction in notchiness when I switched to the Red Line in the BMW but as the 996 is my daily driver I am reluctant to experiment too much and was wondering if anyone had tried the Red Line 75/90ns - which is advertised as "developed for Porsche" on the Porsche Shop site?

Any recommendations very welcome.

[Loren]

Please do a search this has been covered before.

[nos4a2]

Please do a search this has been covered before.

Er... I did and came up with http://www.renntech.org/forums/index.php?s...&hl=redline which didn't really answer my question. If you know of a thread which better answers my question perhaps you would be kind enough to share it with me?

[Loren]

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

http://www.renntech.org/forums/index.php?s...&hl=redline

and there are more if you are interested...

[nos4a2]

Loren, thank you very much - I don't know why my search failed to yield the results that you linked but they are very informative. It looks like I will be giving the Redline 75W90 NS GL-5 a try.

[Stefan]

It looks like I will be giving the Redline 75W90 NS GL-5 a try.

FWIW, I used that in my Boxster and it made the shifting much more notchy. I had spoken to Redline on the phone twice to clarify that this was what they recommended. I replaced it with the factory fluid and the shifting was good again.

[nos4a2]

It looks like I will be giving the Redline 75W90 NS GL-5 a try.

FWIW, I used that in my Boxster and it made the shifting much more notchy. I had spoken to Redline on the phone twice to clarify that this was what they recommended. I replaced it with the factory fluid and the shifting was good again.

Well, the car is booked in to my local independent in two weeks time and I will be trying the Redline. I will let you all know how I got on.

[flyingpenguin]

It looks like I will be giving the Redline 75W90 NS GL-5 a try.

FWIW, I used that in my Boxster and it made the shifting much more notchy. I had spoken to Redline on the phone twice to clarify that this was what they recommended. I replaced it with the factory fluid and the shifting was good again.

Well, the car is booked in to my local independent in two weeks time and I will be trying the Redline. I will let you all know how I got on.

I am using the Redline Heavy Shockproof. No shifting issues when cold, and supposedly much better protection than regular gear oil.

I have been using this for over 30K miles now with at least 5K on track and the gear box is holding out very well.

JP