Gear Oil

[kingdon]

I am installing the stage three south bend today and decided to change my gear oil what brand oil and grade oil should I use on a 2000 A4 1.8T 160 miles on the clock thanks guys.

[BADB5A4]

Tranny or Diff?
Auto/ Manual?

[SpoolinPelican]

Tranny or Diff?
Auto/ Manual?

Tranny and Diff take the same. Auto or manual? He is putting in a clutch, unless SB has a stg 3 torque converter?............



Search is your friend
75W90 full synthetic

[BADB5A4]

Oops missed the first part..manual it is then

http://www.audiforums.com/forum/showthread.php?t=18729

[djwimbo]

You should be using either a synchromesh or a GL4 rated gear oil 75/90 or 80/90.
I believe I used the Mobil 75W90, but that's GL5 rated, I don't know if it will cause any long term issues or not. I did some research and my understanding is that GL5 has better lubricating properties than GL4, and Mobil claims their Syn 75W90 exceeds all GL ratings.

I'm going to use a different brand next time and see if I notice a difference.

and FWIW, I get the stupid hard shift into 2nd on days below 20*F.

[Squarrl]

GL5 will eat brass which is what your syncromesh is. GL5 is fine for rear diff but the front tranny needs GL4. Redline MTL90 and RoyalPurple make a synthetic GL4 75w-90.
DJwimbo i would get that out of your tranny and put in GL4.

[djwimbo]

i would get that out of your tranny and put in GL4.

Good to know. I'm a little pissed b/c apparently nobody knew that when I asked, but that's how things go right?

... now that I'm actually looking I remember doing this before and saying "F- it, GL5 will work just fine.. it has a higher number, it must be better". The underlying theme was that I was on my 20min break from school and grabbed what I thought was right. I guess I'll have to change that soon.

[mike-2ptzero]

I run Motul 300 with a little Redline Shock mixed in.

[Spykce]

Not to thread jack, but what does the center dif take? same thing? I'm looking at doing a refill on my tranny and difs.

[Squarrl]

Good to know. I'm a little pissed b/c apparently nobody knew that when I asked, but that's how things go right?

... now that I'm actually looking I remember doing this before and saying "F- it, GL5 will work just fine.. it has a higher number, it must be better". The underlying theme was that I was on my 20min break from school and grabbed what I thought was right. I guess I'll have to change that soon.

Yah I know took me a while to find out what GL-4 ment. The maxim bigger number doesn't work on brake fluid either since DOT5 is not for your car as well... but DOT 5.1 is oh why must they confuse us.

[mike-2ptzero]

Not to thread jack, but what does the center dif take? same thing? I'm looking at doing a refill on my tranny and difs.

Center diff is part of the transmission, so what ever you put in the trans will end up in the center diff.

[Spykce]

good to know, thanks!