Re: back differential leaks

["Fred Munro" <munrof@isys.ca>]

Hi Maksim;

    Differential leaks at the axle hubs are fairly common on older high
mileage cars. The axle flange seal needs replacing.
    The gearbox (and middle & front differentials) uses a synthetic Audi G50
75w90 oil or equivalent. The rear differential uses a mineral hypoid oil or
a synthetic oil, but not usually the same oil as the gearbox due to the
expense of the gearbox oil. I don't know if the gearbox oil can be used in
the rear differential, but I do know that the synthetic rear differential
oil cannot be used in the gearbox (says so right on the bottle!).

HTH

Fred Munro
'91 200q  272k km
----- Original Message -----
From: Maksim Libenson <max@voras.lt>
To: <quattro@coimbra.ans.net>
Sent: Friday, April 16, 1999 4:36 PM
Subject: back differential leaks


> Hello,
>
> I have problem with rear differential. I can see some leaks
> at the connection of differential and one of the hubs.
> When I bought my '88 90q six month ago it was OK
> Three month ago I took my Audi to service center and
> during the check-up they added some oil to the rear differential.
> Now I think that they probably used wrong oil. I think
> they added same kind of oil to the gear box and rear diff.
> Is it OK, o is it different? May be it is good idea to change
> oil in rear diff? What kind of oil I should use for the rear
> diff, and what kind of oil for gear box? I suppose that
> front and middle differentials interconnected with the gear box
> and use same oil, is it right?
>
> It is my first post to the list, I would appreciate your answers.
>
> Max Libenson
> Klaipeda, Lithuania
> max@voras.lt
> '88 Audi 90 Q
>