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Old 07-24-2014, 07:57 PM   #1
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Default Quattro Drive Line Fluids

SO, what are the recommended fluid for the rear diff and the center diff (Transfer case).

I have some seeping seals, and don't want to dig into them right now, but want to check (and top up) the fluids.
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Old 07-25-2014, 08:06 AM   #2
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Seems factory is Fuchs Synthetic, and lots of people like Motul 300 or Liqui Moly.
And lots of people ask about Mobil 1.

Of course all the discussions then break down into arguing over GL4 vs. GL5 in transmissions and the effect on brass syncros, and the question as to which fluids are ok/best for the Diff and center Diff are lost.
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Old 07-25-2014, 08:36 AM   #3
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Test Post...
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Old 07-25-2014, 09:26 AM   #4
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Test received, 5 by 5!
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Old 07-25-2014, 09:34 AM   #5
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Test received, 5 by 5!
Please use quote and reply so posts are threaded correctly.
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Old 07-25-2014, 10:01 AM   #6
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center diff is not a transfer case. It is a torsen diff.

In general, there is little advantage to using other than audi fluid - its not that costly. I'd avoid mixing fluids unless you know that they are compatible.

OEM fluid is ESSO LT 71141 9 according to the guys who make it, ZF)

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Old 07-25-2014, 10:45 AM   #7
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center diff is not a transfer case. It is a torsen diff.

In general, there is little advantage to using other than audi fluid - its not that costly. I'd avoid mixing fluids unless you know that they are compatible.

OEM fluid is ESSO LT 71141 9 according to the guys who make it, ZF)

Grant

That seems to be the ATF not the diff fluid, but not sure on this car if the center diff is lubed with the AT or separately.

"Transfer case" is used fairly generically to describe the piece of the driveline that send power to the front and back axles.

So is it ATF (or the proper kind), or Gear Oil (of the proper kind)?
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Old 07-25-2014, 12:05 PM   #8
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So is it ATF (or the proper kind), or Gear Oil (of the proper kind)?
Assuming your car is a slushbox:

Front diff takes gear oil. Automatic section takes ATF. Center diff takes gear oil. Rear diff takes gear oil.

Front, auto, center sections are combined into one unit with three distinct chambers. If you have ATF in your center diff, either someone installed the wrong fluid or you have an internal seal failure.
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Old 07-25-2014, 04:40 PM   #9
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Sorry, brain fart. Yes, the spec i gave is for the transmission, the final drive/diff uses gear oil. Check the specs in the manual. The center/front one is combined final drive and torsen i believe

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Old 07-26-2014, 11:36 AM   #10
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So back to the question I asked.

Any gear oil, or some specific brands/types?
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Old 07-26-2014, 11:36 AM
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