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  • Type 85 CQ transmission oil

    Hi, can anyone recommend gearbox and diff oil for my 1987 cq ?

    Also, does the gearbox need removing to change the front and centre gear oil? Or is it all shared with the gearbox?
    C4 A6 AEL avant quattro: daily

    TYPE-85 Coupe Quattro: clicky
    2.5L GTi engineering RE2500 190hp.180lb
    Schrick 272 cam
    C A C 2.5" T304 Exhaust
    ITG filter

  • #2
    Castrol Syntrans Transaxle 75W90 in main gearbox. No need to remove gearbox. Two drain plugs.
    Rear diff EP90 gl5 spec. I use Morris EP90 gear oil. Buy new plugs before you start.
    Nothelle S2 Avant
    Black Ur project
    Ocianic Ur project gone
    S2 Coupe project gone
    Urs6 plus project gone

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    • #3
      Originally posted by Tractor Dave View Post
      Castrol Syntrans Transaxle 75W90 in main gearbox. No need to remove gearbox. Two drain plugs.
      Rear diff EP90 gl5 spec. I use Morris EP90 gear oil. Buy new plugs before you start.
      Thanks! Do you know how many litres they need?

      A Google search yielded this:
      • " Gearbox and front differential: GL4 SAE 80.
        • 3.2 litres to 22 07 5
        • 2.2 litres from 23 07 5.
      • Rear differential: GL5 SAE 90. 2.2 litres.
      • Torque all plugs to 25Nm. "
      But 20vcqdriver on classic audi has advised:

      "Rear diff takes less than 2litres. The gearbox 4.5 assuming you get all the old stuff out ."
      C4 A6 AEL avant quattro: daily

      TYPE-85 Coupe Quattro: clicky
      2.5L GTi engineering RE2500 190hp.180lb
      Schrick 272 cam
      C A C 2.5" T304 Exhaust
      ITG filter

      Comment


      • #4
        20vcqdriver sounds about right.
        Nothelle S2 Avant
        Black Ur project
        Ocianic Ur project gone
        S2 Coupe project gone
        Urs6 plus project gone

        Comment


        • #5
          Nothing wrong with Morris EP90, I use Audi oil as I have a TPS account and it's therefore affordable...

          The rear diff is a bit of a fiddle on B3 chassis, it's not technically difficult, it just take's a while to get the new oil in without making a mess.

          I rig a 1/4" bore clear pipe up to a small funnel and cable tie it to the offside the rear spring, pop the end in the fill hole and gradually add oil until it's up to level, then get under the car and put the end of the pipe into an oil bottle to take the excess, unless of course your judge it just right. Trying to squirt it in using the neck on the bottle works but makes a lot of mess.

          At work we use a giant syringe which is designed for this purpose, you can put as much or as little pipe on the output as you want, save's a lot of pissing about!

          Make sure you can undo the fill plugs before touching the drain ones!

          And getting new one's is always a good idea.
          1989 B3 2.0 3A 80 quattro... Budget 1.8T Project.
          1992 C4 100 2.8 Avant quattro... Mobile Sitting Room.
          1995 RS2... MTM K26/7 380 BHP Conversion.
          1990 Corrado G60... Breaking For Parts.

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          • #6
            Forgot to say, make sure you use a GL4 oil in your gearbox. The GL5 stuff contains sulphur which will eat away your brass synchros. As Kit says, Sometimes genuine Audi stuff is surprisingly reasonable from TPS.
            Nothelle S2 Avant
            Black Ur project
            Ocianic Ur project gone
            S2 Coupe project gone
            Urs6 plus project gone

            Comment


            • #7
              Cheers guys.. Do know what Size plugs I need on a TYPE85 1987 CQ ?
              C4 A6 AEL avant quattro: daily

              TYPE-85 Coupe Quattro: clicky
              2.5L GTi engineering RE2500 190hp.180lb
              Schrick 272 cam
              C A C 2.5" T304 Exhaust
              ITG filter

              Comment


              • #8
                I think you will find its these for both drain and fill.
                https://www.ebay.co.uk/itm/VW-M24x1-...edirect=mobile
                Nothelle S2 Avant
                Black Ur project
                Ocianic Ur project gone
                S2 Coupe project gone
                Urs6 plus project gone

                Comment


                • #9
                  Originally posted by Tractor Dave View Post
                  I think you will find its these for both drain and fill.
                  https://www.ebay.co.uk/itm/VW-M24x1-...edirect=mobile
                  Cheers for that!. So I need 4 of these I presume?
                  C4 A6 AEL avant quattro: daily

                  TYPE-85 Coupe Quattro: clicky
                  2.5L GTi engineering RE2500 190hp.180lb
                  Schrick 272 cam
                  C A C 2.5" T304 Exhaust
                  ITG filter

                  Comment


                  • #10
                    Is this okay for gearbox?

                    https://www.opieoils.co.uk/p-89825-f...-gear-oil.aspx
                    C4 A6 AEL avant quattro: daily

                    TYPE-85 Coupe Quattro: clicky
                    2.5L GTi engineering RE2500 190hp.180lb
                    Schrick 272 cam
                    C A C 2.5" T304 Exhaust
                    ITG filter

                    Comment


                    • #11
                      Yes if it's a GL4. Double check.
                      Nothelle S2 Avant
                      Black Ur project
                      Ocianic Ur project gone
                      S2 Coupe project gone
                      Urs6 plus project gone

                      Comment


                      • #12
                        Originally posted by MGaz View Post
                        Hi, can anyone recommend gearbox and diff oil for my 1987 cq ?

                        Also, does the gearbox need removing to change the front and centre gear oil? Or is it all shared with the gearbox?
                        Do you have tha 016 gearbox?

                        There was a change in the filler plug location on the 016 type Quattro transmissions. Beginning in 9/13/1988 the filler hole was raised 15mm and the capacity increased to 2.75 qts. (3.028357592466 L (liter)).



                        The previous capacity was shown as 2.33 qts. (2.565844796526 L (liter)) With the new fill plug position, the transmission is full when the oil level is 7mm below the lower edge of the filler plug.



                        However, during repairs, or fluid changes, the transmission can be filled up to the bottom of the filler plug hole and this would correspond to filling it with 3.4 qts. (3.744151205231 L (liter)).



                        The rear differential takes slightly under 2 quarts (2.20244188543 L (liter)), approximately 1.6-1.8 qts. The drain and fill plugs should be torqued to 18ft-lbs (24.40Nm)
                        Last edited by ZiMMeN; 9 June 2022, 19:39.

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                        • #13
                          Originally posted by Tractor Dave View Post
                          Yes if it's a GL4. Double check.
                          Cheers everybody.

                          so I went ahead and got Fuchs titan race Syn5 (GL5) 75-90 for the rear differential

                          and

                          Fuchs titan race synchro (GL4) 75-90 for the gear box.

                          Neither of them say EP on them but both are fully synthetic oils. Hopefully these will both be suitable?
                          C4 A6 AEL avant quattro: daily

                          TYPE-85 Coupe Quattro: clicky
                          2.5L GTi engineering RE2500 190hp.180lb
                          Schrick 272 cam
                          C A C 2.5" T304 Exhaust
                          ITG filter

                          Comment


                          • #14
                            EP just stands for extreme pressure. They will be good. I like the Fuchs stuff.
                            Nothelle S2 Avant
                            Black Ur project
                            Ocianic Ur project gone
                            S2 Coupe project gone
                            Urs6 plus project gone

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