Auto gearbox oil change - a8 quattro d2

[Doug773]

Hi there!

My car is a 1996 A8 D2 4.2 QUATTRO, 94K.
My mechanic told me it would be a good idea to change the transmission oil.

The Audi dearlership in London was not able to sell me the right kit for that because they could not figure out which transmission my car uses: CML or CMN, by the chassis number I provided them.
My question is: do you guys think that it's really necessary to do that? Will it do any good for the transmission life? I never had any issue with it (knock on the wood 3 times...).
I've checked all my car documentation and couldn't find anything about that transmission codes.
Any help will be very welcome.

Doug