80 Quattro rear diff capacity and oil grade ?

[R5T]

Evening all,

I'm sure a handfull of you may have glanced through my diff jump/bang query, Tuesday night I swapped the nose cone of the diff over and my problem is still there.

I'm going to be swapping the whole rear diff unit over at the weekend, and as I have the spare diff off the car it's going to be a lot easier to change the oil !

What's the capacity of the rear diff ? And I've been told that a decent 75w85 will be sufficient ? However GL4 or GL5 ?

Thanks guys

Sam

[Val]

Autodata:
2.2L 75W/90 synthetic

[R5T]

Thanks Val any idea which GL rating I should use ?

[Val]

You can always buy OEM axle oil.
G052145A1 - 0.5L 15 eur
G052145S2 - 1.0L 28 eur

[R5T]

Okay thanks

[Error404]

Gl5

[R5T]

Brilliant thanks error, much appreciated

[WidowmakerS2]

Any danger in overfilling the rear diff?
Think I might have added a tad too much. I guessed it would come out the plug on top, and it seems that way..

[Bowie69]

Unlikely you could overfill, it would just run out.

[s2driveruk]

if the breather cap is moving freely at the top you should be ok, if not it will push past the seals on either side I would expect. If you think you have over-filled I'd remove some of the fluid and re-do to be safe, those seals are a PITA to do at the best of times.