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Rear Differential Oil Change

Discussion in 'A3/S3 Forum (8L Chassis)' started by Jonesy, Oct 29, 2010.

  1. Jonesy
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    Jonesy Member

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    [Oct 29, 2010]
    Hi, I’ve had a whine from the rear of my car for a while now and didn’t think there was much i could do. I found a guide explaining how to change the rear dif oil here Audi area: Audi A4 (B5). Rear Differential Oil Change

    Should be pretty similar to the s3 I would have thought. Anyone done this and fixed the annoying whining noise?

    Also what oil do Audi recommend?

    Thanks
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  3. metricspaces
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    metricspaces Member

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    [Oct 29, 2010]
    It's recommended that you change the haldex oil every 20k miles, and change the filter every 40k miles.

    Changing the oil may not solve your problem. But worth a shot. The alternative solutions would be a lot more expensive - new diff or recondition $$$$!
    #2
  4. Jonesy
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    Jonesy Member

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    [Oct 29, 2010]
    I read on here that the haldex system is seperate to the rear dif?? I have already changed haldex filter and oil last month. If its the same unit, then ill leave it as i cant afford to have a new one or get it reconditioned!!
    #3
  5. s3dave
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    s3dave TFSI Hybrid

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    [Oct 29, 2010]
    Please dont listen to everything on a forum......if your diff is whineing the damage is done end of....
    Oil is not a magic cure for everything....wear is wear metal is metal when they dont meet properly its foooked....:(
    Last edited: Oct 29, 2010
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  6. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Oct 29, 2010]
    apparently it is a seperate unit..... although my ex Audi mechanic didnt agree, some on here have actually changed the offending item so it must exist
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  7. pj123
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    pj123 Member

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    [Oct 30, 2010]
    Haldex and rear diff are two completely seperate units bolted to eachother, the haldex unit being just forward of the rear diff. The haldex oil is the one that you must change every 20k, oil and haldex filter every 40k. The rear diff Audi themselves say is sealed for life as I was tempted to change the oil in mine. If you buy a new rear diff it comes prefilled with the correct amount of oil. The guy at audi said you probably could change the oil if you wanted but wondered how you would know you have exactly the right amount of fluid in there, as it may be that the correct fill level is up to the plug, but maybe not.

    How many people check or change the rear diff oil on an S3 and at what intervals?
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  8. Jonesy
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    Jonesy Member

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    [Oct 30, 2010]
    Thanks for the info, I hope someone out there has done this job and posts their experience.
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  9. the911kid
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    the911kid audi a3 2.0tdi quattro

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    [Nov 1, 2010]
    hi anyone know how to change the haldex oil and filter on a3 at not getting the correct info as pics show a drain/filler plug at bottom 5mm hex but there is nothing like this on mine any advise would be much apprecaited
    #8
  10. Hellman
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    Hellman New Member

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    [Jan 30, 2011]
    Hi all.

    I've got an 02 S3. Had it from 17k miles. Now got 124k on it. I've had the "locking wheels on u-turns" for 6 mths. It's just progressed to the whining noise. Audi say I missed a haldex oil change and caused the problem and now need new diff. I've got a friend who works there who said just search for a reconditioned diif and we'll fit it. The fact is that it seems the only way out of this is to refit.

    So, that said, does anyone know where to get a reconditioned s3 diff as Audi have quoted me close to £2000 for a new one, and won't fix the old one sying the labour is to intensive and won't touch it?

    Cheers,

    Nik.
    senseinik-r28@sky.com
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  11. Jonesy
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    Jonesy Member

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    [Mar 9, 2011]
    Hi, ive still got the nosie and I think it may have got a little worse. I wonder if you could wrap it in sound proofing to keep it quiet lol. Im def gonna attempt to replace oil this weekend, ill let you know how it goes. Fingers crossed the whine will go.
    #10
  12. 666markyboy
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    666markyboy Well-Known Member

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    [Mar 10, 2011]
    Is it an A3 Quattro ???? if not you don't have a Haldex as it's part of the 4 wheel drive system and only on A3 Quattro's and S3's
    #11
  13. The Doctor
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    The Doctor Well-Known Member

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  14. Jonesy
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    Jonesy Member

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    [Mar 25, 2011]
    Just to update, I changed my rear dif oil, bought the correct stuff from Audi for £22!!! took about half an hour and after a quick test drive I still have the annoying whine, noooooooo!

    Could it be a rear wheel bearing? The noise/whine gets louder with speed and stops when applying gas. Turning left and right doesn't affect it and the noise continues when I drop it out of gear. How do you tell if the rear wheel bearing needs replacing?

    Thanks
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  15. superkarl
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    superkarl MAN OF STEEL

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    [Mar 25, 2011]
    Wheel bearings make a distinct whine/humming noise, might have been that all along. There will be play in it if its goosed
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  16. Jonesy
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    Jonesy Member

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    [Mar 25, 2011]
    I did check the rear o/s when I was changing the oil as it was off the ground but didn't get to check the rear n/s so that will be my job tomorrow. I've got a spare rear wheel bearing kit laying about somewhere. Fingers crossed.
    #15
  17. Jonesy
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    Jonesy Member

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    [Mar 26, 2011]
    OK, turns out it is my rear dif making the noise. Got it up on the ramps and can hear it coming from the rear differential.

    I noticed that the n/s of the dif looks like this, the driveshaft is covered in oil! [​IMG]

    The o/s is completely clear, think maybe a seal has gone? Can I replace this side part only and not need a whole new unit?

    Any ideas guys

    Allan
    Last edited: Mar 26, 2011
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  18. superkarl
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    superkarl MAN OF STEEL

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    [Mar 26, 2011]
    I don't know much about it, but the rear diff is supposed to be sealed, have to have it off to inspect it to be honest. But in all honesty, its likely to be goosed :(
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  19. superkarl
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    superkarl MAN OF STEEL

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    [Mar 26, 2011]
    Looking at that pic, its strange there is no oil on the diff, its perfectly covered the driveshaft joint all over. I'd be inclined to take that off, which is relatively easy and see what condition its in. Would be good if its just a fucked driveshaft joint! Much better than a naff diff!
    #18
  20. Jonesy
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    Jonesy Member

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    [Mar 26, 2011]
    I know, was so strange and looks like its been covered in oil for ages.
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  21. Jonesy
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    Jonesy Member

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    [Mar 26, 2011]
    Is it possible that rear drive shaft is screwed and is causing the whining noise? Think it will be cheaper and easier to change that than the differential unit.
    #20

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