Rear diff & gearbox oil


Registered User

I have recently replaced my haldex oil & filter and as my car has 120k miles I would like to also replace the rear diff oil and gearbox oil as a preventative measure as to my knowledge they have never been done before, audi say they are sealed for life but I don't trust that. Can somebody tell me which kind of oil I need for both the diff and the gearbox and if there are any special tools required to do it or of it is particularly difficult to do?

A mate told me it wasn't really worth doing if I'm not experiencing any problems, what do you think?

Thank you.
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