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  #1  
Old 29th February 2012, 12:19 AM
Doug773 Doug773 is offline
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Default Auto gearbox oil change - a8 quattro d2

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
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Old 29th February 2012, 02:13 AM
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As your car is a 96, it will more then likely have the four speed box, which is said to be stronger then the fifth speed. Some people think its a good idea to change the fluid, others say if it hasn't been done regularly and you change it for the first time in x amount of years you could end up doing more damage then good, I would leave it as is, especially if it is a four speed.

Follow this guide for part numbers and DIY instructions, welcome to the forum.

http://www.audipages.com/Tech_Articl...servicing.html
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Old 29th February 2012, 03:08 AM
Doug773 Doug773 is offline
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Default Hi Singh!

Thank you so much!

Yes, mine is a faithfull 4 speed box, I've been keeping it for 10 years! No big issues so far, drive just right. But from some 4 years back, running idle it sounds like a diesel engine, no more that nice V8 muted purr. Asked some 4 different technicians to check it, they spent several hours checking every pulley etc and found nothing!
Maybe some valve clattering, I don't know. Otherwise the car run just great. It sounds OK at any rpm above idle.
Have you ever heard something like this before?

Many thanks! BTW, nice MJ pic, one of my fav artists!

Cheers,

Doug

Last edited by Doug773; 29th February 2012 at 03:11 AM.
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Old 29th February 2012, 04:56 AM
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Architex_mA8tey Architex_mA8tey is offline
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Welcome from me too

Your gearbox code should be on your build sticker both on the car (in the spare wheel well) and on the front inside cover of your original service booklet if you have it.

The gearbox code position is shown on this thread HERE

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Old 29th February 2012, 05:51 AM
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>> running idle it sounds like a diesel engine

Camshaft chain tension is maintained by oil pressure in our engines AFAIK.

If oil pressure is not that strong enough at idling, then chain starts to rattle. When RPM goes above idle, the oil pressure becomes strong enough to tension chain properly. Change oil pump and problem should disappear.
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Old 29th February 2012, 06:09 AM
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Quote:
Originally Posted by notorious View Post
>> running idle it sounds like a diesel engine

Camshaft chain tension is maintained by oil pressure in our engines AFAIK.

If oil pressure is not that strong enough at idling, then chain starts to rattle. When RPM goes above idle, the oil pressure becomes strong enough to tension chain properly. Change oil pump and problem should disappear.
But it's a petrol engine so will be cambelt - yes?
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