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Transmission oil colour:

Discussion in 'A3/S3 Forum (8L Chassis)' started by Y83OLK, Aug 13, 2010.

  1. Y83OLK
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    Y83OLK Hulk Smash!

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    [Aug 13, 2010]
    Hi all.
    Changed my gearbox/ transferbox and rear diff oil today.
    Has anyone else done this themselves?

    The gearbox/trannybox oil came out a clearish yellow colour, but the rear diff oil was nearly black.
    Guessing i have an issue going on in the diff somewhere?

    Refilled it with OEm fluid (75/90 i think) which was a lovely red colour... Which has made gearchanges less crunchy and no whine on over run now.

    Any idea why the diff oil could be so dark?
    #1
  2. s3dave
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    s3dave TFSI Hybrid Supporter

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    [Aug 13, 2010]
    how much oil is needed for the gearbox mate, mine has a slight whine
    #2
  3. Y83OLK
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    Y83OLK Hulk Smash!

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    [Aug 13, 2010]
    Mine took just over 3ltr.
    2 3/4...a quick spin up through the gears then an extra half a litre to top up.
    #3
  4. s3dave
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    s3dave TFSI Hybrid Supporter

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    [Aug 13, 2010]
    did not think they took that much cheers anyway, as the whine deff gone then?
    i would not worry about the colour of the oil, its replaced now and working fine....
    #4
  5. sportstractor
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    sportstractor Chugger

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    [Aug 13, 2010]
    I would also not worry about the colour aslong as it not frothy
    #5
  6. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Aug 13, 2010]
    The colour is more likely due to the load it has been put through etc .

    As long as its now changed and it feels better i wouldn't worry, in fact i might do mine later...
    #6
  7. Y83OLK
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    Y83OLK Hulk Smash!

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    [Aug 13, 2010]
    Just thought it may be a sign of bearing/ gear wear or something.
    Glad there were no big metal lumps/ gold coloured swarf stuck to the drain plugs though.

    My whines definatly gone, it used to happen coasting in 1st or 2nd, now all i hear is tyre/ road noise.
    #7
  8. rraghvani
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    rraghvani Whoever does not try, does not learn.

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    [Aug 21, 2010]
    Silly question, but where do you put the gearbox oil in? I can’t find any references to toping up the gearbox oil in the cars manual or this web site.
    #8
  9. rossbrownlee
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    rossbrownlee Ross_S4

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    [Aug 21, 2010]
    Look under the front bumper roughly in front of the passenger seat. You will see a curly black pipe going back and forth, that's for the power steering, just behind that on the front of the gearbox there is a plug maybe about an inch in diameter.
    #9
  10. gavin89
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    gavin89 Wana go Low gotta go Slow

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    [Aug 21, 2010]
    How much did you pay for it?
    #10
  11. rraghvani
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    rraghvani Whoever does not try, does not learn.

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    [Aug 25, 2010]
    Would it be possible to upload a photo of this? Thanks.
    #11
  12. S3 TAM
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    S3 TAM Pocket now empty

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    [Aug 25, 2010]
    Another job for the weekend gearbox and rear diff oil. LOL
    #12

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