Tiptronic Rear Differential Oil Change

[favino1006]

JFP in PA,

Thanks for the info on what not to use... Now, drawing from your experience over the years; care to share what the best/correct gear oil IS?

[favino1006]

Hey Guys,

A follow-up:

I finished the fluid change this morning. Everything went pretty smoothly. I followed the excellent write-up that Andy put together on this forum along with the Pelican write-up. I let my trans. sit and drain overnight without the cover or filter on. I drained 4 1/2 liters total and then managed to put in 5 1/2. After starting up the car and taking it up to 40 C, I then drained a further 2 1/2 liters of partially contaminated fluid (in an effort to flush), then refilled 2 1/2 liters of new fluid back in. So all in all, I ran 7 liters of new fluid through the system but basically put 5 1/2 liters in. I then sealed everything up and went for a drive! The car is shifting through gears absolutely, noticeably smoother. It's awesome.

Now, on to the differential... What looks like it shouldn't be too much hassle, has just been ridiculous! I haven't been able to get the fill plug to break loose. The Bentley book says the plug torques at 22 ft lbs. I've easily put over a hundred on it trying to get it off, without any luck. It looks like it's got locktight or something similar on it and It's such a small space to work in! Anyhow, I'm going to go to an indie shop monday morning and see if those guys can get it open. I'm just amazed, lol. But, happliy, the creepy, guess-work part of the project is done! :dance:

[JFP in PA]

Originally Posted by favino1006

JFP in PA,

Thanks for the info on what not to use... Now, drawing from your experience over the years; care to share what the best/correct gear oil IS?

We get ours from Porsche..............

[JFP in PA]

From the factory, there is often a sealant like material on the plug that really makes difficult to remove the first time. Once it is loose, you will be fine. We clean the factory sealant off the treads and put a drop of anti seize on it before re-torque......

[favino1006]

Awesome. Thanks for the info. That plug is making me crazy, lol.

[Roy_Josef]

Just went through that this weekend. Best way to get the plug out is to pull off the diagonal body brace underneath, it's just a bolt and a couple of nuts. After that you can with the right combination of extensions and breaker bar get a nice 90 degree angle on your ratchet/breaker bar and get the plug out with NO PROBLEMS. I spent 20 minutes trying with the brace in place and couldn't do it. Pulling the brace took all of 2 minutes and after that it was as easy as a girl from Surrey...

[rp123]

Can someone point me to Andy's Tiptronic Rear Differential Oil Change write-up?

[Smallblock454]

There are also other ways to change the ATF. For example the Tom Eckard method: Englisch

Regards
Markus