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skylinrcr01
04-13-2016, 11:32 AM
Is it worth changing out the diff fluid? I know the tranny is a 'lifetime' fill but should be done anyways, was wondering if the diff was the same way. Also is there a front diff? I'm not really sure how AWD works, my previous 2 cars were RWD and either japanese or american haha.

My car is an 05, and has 93K miles, but the tranny was done a few years ago.

SinCityA6
04-13-2016, 11:35 AM
You have a 2 diffs on the car; front and rear. Changing out the diff fluid is never a bad thing.


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skylinrcr01
04-13-2016, 11:44 AM
Thanks for the help, as always Sin. :) Is mobil 1 75w/90 the fluid to use (that's what I used on my old car)? Or is there some specific vag fluid that I need?

sun_dance
04-13-2016, 03:03 PM
remember there's the diff and transfer case fluids.

Differential, 09L Front..........1.1 liters
Differential, 01R Rear..........1.5 liters
Transfer Case, 09L..........0.6 liters

cal3thousand
04-13-2016, 03:03 PM
You have a 2 diffs on the car; front and rear. Changing out the diff fluid is never a bad thing.


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Correction: 3 Diffs

Front, Center and Rear. (EDIT: This is for Tiptronic Quattro)

Center is Torsen and the F/R are both open with electronic locking.


75w90 Mobil 1 is perfect for the front and rear diff.

For the center Torsen, you should use the Audi specific stuff:

https://www.ecstuning.com/Search/G055145A2/ES465418/

se.farrell
04-13-2016, 04:47 PM
Correction: 3 Diffs

Front, Center and Rear. (EDIT: This is for Tiptronic Quattro)

Center is Torsen and the F/R are both open with electronic locking.


75w90 Mobil 1 is perfect for the front and rear diff.

For the center Torsen, you should use the Audi specific stuff:

https://www.ecstuning.com/Search/G055145A2/ES465418/

Sorry to get off topic, there is lots of good info here.

BUTTT..... @cal3thousand you sig. "Just some small cosmetic mods while getting to Stage 0". I died.[hail]

ichi d
04-13-2016, 06:38 PM
every used car i bought, the first thing i do is a tranny and diff flush.

skylinrcr01
04-13-2016, 09:41 PM
Correction: 3 Diffs

Front, Center and Rear. (EDIT: This is for Tiptronic Quattro)

Center is Torsen and the F/R are both open with electronic locking.


75w90 Mobil 1 is perfect for the front and rear diff.

For the center Torsen, you should use the Audi specific stuff:

https://www.ecstuning.com/Search/G055145A2/ES465418/

70 (*&#^$% dollars a bottle! WTF is it? Unicorn blood?

FormulaElement
04-13-2016, 11:55 PM
Ive been using redline 75w90 in all three differentials for 30k miles now and have had no problem. Since changing them I haven't experienced any rumble when turning at full lock at all.

The middle differential is very debatable since it uses a different fluid. Essentially Audi puts fluid with a little higher friction coefficient in it to make sure there no slipping. I have no idea how that would help though and haven't had any problems with the quattro system using the Redline for all three.

FL C6 Avant
04-14-2016, 03:36 AM
Ive been using redline 75w90 in all three differentials for 30k miles now and have had no problem. Since changing them I haven't experienced any rumble when turning at full lock at all.

The middle differential is very debatable since it uses a different fluid. Essentially Audi puts fluid with a little higher friction coefficient in it to make sure there no slipping. I have no idea how that would help though and haven't had any problems with the quattro system using the Redline for all three.

been running rediline 75w90 in all 3 of my nissan rear differentials for >10 yrs. very happy with it. haven't done the quattro yet, but probably would use the factory recommended friction modifier. I think i saw once where just the 'additive' could be bought, but may be remembering wrong.

cal3thousand
04-14-2016, 02:20 PM
70 (*&#^$% dollars a bottle! WTF is it? Unicorn blood?

It's not a regularly replaced consumable. $70 for a couple times in the life of a car isn't too bad. At least it's not like paying for those damn urea refills on new diesels.


Ive been using redline 75w90 in all three differentials for 30k miles now and have had no problem. Since changing them I haven't experienced any rumble when turning at full lock at all.

The middle differential is very debatable since it uses a different fluid. Essentially Audi puts fluid with a little higher friction coefficient in it to make sure there no slipping. I have no idea how that would help though and haven't had any problems with the quattro system using the Redline for all three.

Good to hear that it helps with Quattro rumble. Maybe I should hasten and priortize this bit of maintenance in my upcoming schedule. Come to think of it, I'm going to do 1 differential per week to see if there are individual effects. Will start with the rear, then front and finish off with the expensive stuff.