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Front and middle differential fluid change 02 A6 2.7

Audi A6 The mid-sized Audi A6 model offers more room to the driver and passengers over the A4 line.

Front and middle differential fluid change 02 A6 2.7

  #1  
Old 07-31-2009, 01:20 PM
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Default Front and middle differential fluid change 02 A6 2.7

Hi everyone ! I have recently read the DIY to change the rear diff fluid but does anyone have advice or instructions regarding the middle and front differentials ?? I suspect the front wouldn't be too bad but the middle ???
 
  #2  
Old 08-03-2009, 11:03 AM
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Really ?? No love on this one ?
 
  #3  
Old 08-03-2009, 01:21 PM
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middle is your trany not a diff. That is a PITA you need a vagcom, 9liters of fluid( takes a little over 6) jack stands and a weekend to do it. Measure and save everything you take out.

Front has a 8mm allen you can reach it easiest by removing the front wheel, rotor and caliper on passenger side. Then you will need a good allen socket possibly one with a ball head on an extension with a breaker bar. Once it's out you need to suck the fluid out. There is no bottom drain on it.

Rear drains out at bottom plug, but open the side first because if you can't get that out and you have already drained the gear oil, your screwed.
 
  #4  
Old 08-03-2009, 02:42 PM
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Originally Posted by Jackmup View Post
middle is your trany not a diff. That is a PITA you need a vagcom, 9liters of fluid( takes a little over 6) jack stands and a weekend to do it. Measure and save everything you take out.

Front has a 8mm allen you can reach it easiest by removing the front wheel, rotor and caliper on passenger side. Then you will need a good allen socket possibly one with a ball head on an extension with a breaker bar. Once it's out you need to suck the fluid out. There is no bottom drain on it.

Rear drains out at bottom plug, but open the side first because if you can't get that out and you have already drained the gear oil, your screwed.
Actually there are the middle and front differential fluid changes in addition to the tranny fluid change; however, the middle differential fluid never, I mean never, require change. It is listed in the ZF product manual. As for the front one, there is no drain and the fill hole is located on above the passenger front axle. Make sure your car is cool and you will need a hand pump with flexible tubing about 2 feet long to access the fill/drain hole. Just snake in the tubing and drain the fluid as much as you can, and refill the fluid until it slowly drains out.
 
  #5  
Old 08-03-2009, 02:57 PM
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What was that, 75W90 gear oil?
thanks
 
  #6  
Old 08-03-2009, 08:25 PM
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The 1996, 1997 ( 1998 wagon ) A6 Quattro with C4 chassis and 2.8 L 12 valve engine have the center differential directly above the two catalytic converters. When the gear lube leaks out through the worn propeller shaft flange seal, the catalytic converters have to be removed to check or add gear lube.
You should get a copy of the Audi shop service manual DVD or do a search of the forum.
 
  #7  
Old 08-03-2009, 09:51 PM
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Go to www.vagcat.com
Then in their catalog look for a 2002 A6 Quattro 2.7L, then TORSEN DIFFERENTIAL / FLANGE SHAFT / FOR 5-SPEED AUTOMATIC GEARBOX / 2.4/2.7 ltr / 3.0ltr. / quattro. They have picture of the center differential. However, this site is for the European Audi, so it may be different for the USA models.
 
  #8  
Old 08-03-2009, 11:46 PM
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however, the middle differential fluid never, I mean never, require change.
Sure it does... Just be sure to use Synthetic 75W-90 GL-4, not GL-5, which can be used in front/rear.
 
  #9  
Old 04-09-2014, 09:31 PM
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why G4 and not G5?
 
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