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What Gearbox oil for RS2

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  • What Gearbox oil for RS2

    I have just had the 2nd and 3rd hear syncro and a new selector fork fitted to my gearbox can anyone suggest an appropriate gearbox oil. I just got a quote for £90 for 3 litres from Audi bit rich as the car will not be doing high speeds or high milage.

  • #2
    The Fuchs stuff is good
    Nothelle S2 Avant in restoration
    Wr Ur Quattro (also in restoration)

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    • #3
      hi dave will look it up

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      • #4
        Fuchs is "first fill" for many car manufacturers, 'nuff said.

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        • #5
          Originally posted by joss01 View Post
          I have just had the 2nd and 3rd hear syncro and a new selector fork fitted to my gearbox can anyone suggest an appropriate gearbox oil. I just got a quote for £90 for 3 litres from Audi bit rich as the car will not be doing high speeds or high milage.
          It's an RS2, it must go high speeds and be driven I drive with Heavy ShockProof in my Urs4 for 5 years without problem, just need to warm up the oil to change gears quick. For my RS2 i will pour in Redline synthetic 75/90W gear oil

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          • #6
            Millers Oils TRX Synth - 75w90 is the best

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            • #7
              thanks for the advice.

              Anyone going to Beaulieu Audi meet on April 19

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              • #8
                x3 on the Fuchs.

                MOTUL Gear 300 is also a high quality product.
                Find me on Instagram @pry4sno
                2010 Golf Sportwagen TDI /// #farmenwagen
                2002 Dodge Ram 2500 24v Cummins 4x4
                1992 80q 20v /// Eventual AAN'd Winter Sled
                1990 Cq /// Project: Because Racecar

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                • #9
                  Years ago there was a guy named Mance, went by the moniker Pissedoff90. He was a engineer/machinist/etc. Made some good parts for our cars and did a lot of testing of various things. He ran a lubrication-pressure test on some gear lubes. He came up with the combination of 4to1 Redline MTL to Redline 90 gear oils. This is what he used in his transmission.
                  I have used this combo for years in all my manual cars. Never had a problem. This includes about 25 track weekends in the coupe.

                  Greg W.
                  They can have my car when they pry my cold dead fingers from the steering wheel.

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                  • #10
                    thanks Greg

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                    • #11
                      Fundamentally, use fully synthetic GL-4.

                      GL-5 oil is what trashes syncros - do not use a GL-5 oil or combined GL-4 & GL-5 specification "gear oil". Race grade oils are more often than not formulated for use with dog boxes and no good for syncro boxes. The way the sycnros work means they need some friction in order to match the gear speeds before the collar can engage. GL-5 oil doesn't allow that to happen properly and the result is mashed dog teeth and trashed syncros.
                      Panthero Coupé quattro 20vt
                      Indigo ABY coupé
                      Imola B6 S4 Avant

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                      • #12
                        Originally posted by Error404 View Post
                        Fundamentally, use fully synthetic GL-4.

                        GL-5 oil is what trashes syncros - do not use a GL-5 oil or combined GL-4 & GL-5 specification "gear oil". Race grade oils are more often than not formulated for use with dog boxes and no good for syncro boxes. The way the sycnros work means they need some friction in order to match the gear speeds before the collar can engage. GL-5 oil doesn't allow that to happen properly and the result is mashed dog teeth and trashed syncros.
                        Finally, the correct answer
                        sigpic
                        1991 Audi S2 3B - 2.5 Stroker engine
                        1997 A6 2.5TDi quattro avant - C4
                        1976 RD250E / 350LC cafe racer

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                        • #13
                          is this the same for 6speed s2 box?
                          if so which viscosity GL4?

                          cheers
                          Last edited by tango123; 23rd January 2020, 14:54.

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                          • #14
                            I use this:-

                            https://www.opieoils.co.uk/p-739-cas...arbox-oil.aspx

                            It was the only GL4 only synthetic oil I could find. Works great
                            sigpic
                            1991 Audi S2 3B - 2.5 Stroker engine
                            1997 A6 2.5TDi quattro avant - C4
                            1976 RD250E / 350LC cafe racer

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                            • #15
                              I used CASTROL SYNTRANS TRANSAXLE 75W90

                              Audi Coupe Quattro 2.3 20V

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