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Thread: Best oil for a S3 suffix D box?

  1. 15th November 2016, 04:25 PM #1
    rover-56's Avatar
    rover-56
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    Best oil for a S3 suffix D box?

    What oil do you use in your gearbox?
    My S3 suffix D box syncros are a little notchy, don't know what oil is in there, probably whatever the army used. I have been maintaining the level with Castrol 75W90 hypoid.
    I was impressed with the difference VMX80 made in the Defenders R380 when I changed it recently. Don't know what it was that came out, but it wasn't ATF.
    Thinking of using it in the S3 box. Is that a good idea?

    Terry
    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.
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  2. 16th November 2016, 06:14 AM #2
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    Here is a link to an AULRO thread about the subject.


    EP 90 Gear Oil for Transmission Gearbox


    When I fitted a Roamerdrive to my series 3 I followed the Globalroamer recommendations and changed to a GL4 75W-90 in the transfer case, and also the gearbox. I didn't notice any difference with gear changes etc. but it certainly knows how to find it's way out! I think it soaks through the alloy!


    Cheers, Mick.
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  3. 16th November 2016, 08:06 AM #3
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    rover-56
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    Thanks Mick,
    Yes I noticed a new seep out of the R380 after the oil change. Probably will pour out of the S3.
    I will have a read of that link.
    Cheers,
    Terry
    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.
    2010 Guzzi 750
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  4. 16th November 2016, 09:04 AM #4
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    rover-56
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    Have been reading a bit about the art of choosing gearbox oil.
    Seems we should not be using GL5 oil in synchro gearboxes?
    The Castrol EPX oil I use is GL5, the VMX80 is GL4
    I know the VMX80 transformed the gearshift in the R380, it now willingly changes down from 5th to 4th, reminds me of the Alfa Giulia I once owned.
    I will change the S3 GB oil to VMX80 and see what happens.
    Found a couple of interesting reads along the way:

    Differences between EP90 GL4 and GL5 - Automotive lubricant engineering - Eng-Tips
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    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.
    2010 Guzzi 750
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