504 BA 7/4 gearbox oil
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  1. #1
    Fellow Frogger! Doush_504's Avatar
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    Default 504 BA 7/4 gearbox oil

    Hello everyone
    I was wondering if anyone uses anything other than 10w40 engine oil in their 4 speed boxes.
    I've been using it for quite a few years now with no issues.

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    When looking for gearbox oil for the 5 speed manual 308, I came across some GL-4 spec oils (75W-80 or 90) which seem to have about the same vistcosity as the 10w40 (Liqui Moly) I use in my gearbox while having the advantage of being specifically designed for gearboxes.

    Here is the liqui moly 10w-40 I use:
    https://pim.liqui-moly.de/pidoc/P000...40-37.0-en.pdf

    And the Amsoil 75w90 GL-4 for comparison:
    https://www.amsoil.com/lit/databulletins/g2077.pdf

    Amsoil's cold viscosity is even lower, while having a high viscosity index.
    Quite tempted to give it a try.
    Chadi

    1982 504 SR white manual sedan with A/C (266 000 Km)
    2012 308 1.6 VTi Vapor Grey manual H/B (52000 Km)
    1994 405 1.6 white manual sedan (236 000 Km)
    1992 605 SV24 (91 000 Km)
    2005 406 2.0L automatic (Replaced with a 2013 C5)
    1983 505 GR white manual sedan with A/C (170000 Km)

    All since new


  2. #2
    1000+ Posts bluey504's Avatar
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    Chadi, Just use engine oil, 20W50 is the Australian (Penrite) specification. 10W40 works keep using it! Just change at the recommend intervals and actually check how much has drained out.
    Oil is slippery stuff and gearbox oil has been known to migrate into the torque tube, as has diff oil or it just drips out!

    Brendan.
    p.s. Remember this gearbox was designed when the only oil type was mineral. The only synthetic use was clothing!
    Last edited by bluey504; 9th January 2020 at 05:56 PM. Reason: Extra info

  3. #3
    1000+ Posts Peter C's Avatar
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    The main problem I've encountered with BA7/4 is that the extension housing starts leaking at the vertical selector shaft. A weak point and you really need to check gearbox oil level regularly.

  4. #4
    Fellow Frogger! Doush_504's Avatar
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    Quote Originally Posted by bluey504 View Post
    Chadi, Just use engine oil, 20W50 is the Australian (Penrite) specification. 10W40 works keep using it! Just change at the recommend intervals and actually check how much has drained out.
    Oil is slippery stuff and gearbox oil has been known to migrate into the torque tube, as has diff oil or it just drips out!

    Brendan.
    p.s. Remember this gearbox was designed when the only oil type was mineral. The only synthetic use was clothing!
    My owner manual says 10w40 that's why I use it and thought 20w50 would be too thick.
    Do you mean I should use mineral oil ? because all 10w40 I can find is semi-synthetic.
    To go mineral I would need to go up to 15w50 or 20w50.
    Chadi

    1982 504 SR white manual sedan with A/C (266 000 Km)
    2012 308 1.6 VTi Vapor Grey manual H/B (52000 Km)
    1994 405 1.6 white manual sedan (236 000 Km)
    1992 605 SV24 (91 000 Km)
    2005 406 2.0L automatic (Replaced with a 2013 C5)
    1983 505 GR white manual sedan with A/C (170000 Km)

    All since new


  5. #5
    Fellow Frogger! Doush_504's Avatar
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    Quote Originally Posted by Peter C View Post
    The main problem I've encountered with BA7/4 is that the extension housing starts leaking at the vertical selector shaft. A weak point and you really need to check gearbox oil level regularly.
    I also encountered that a few years back and had it properly sealed. So gearbox oil level no longer goes low.
    Chadi

    1982 504 SR white manual sedan with A/C (266 000 Km)
    2012 308 1.6 VTi Vapor Grey manual H/B (52000 Km)
    1994 405 1.6 white manual sedan (236 000 Km)
    1992 605 SV24 (91 000 Km)
    2005 406 2.0L automatic (Replaced with a 2013 C5)
    1983 505 GR white manual sedan with A/C (170000 Km)

    All since new


  6. #6
    1000+ Posts Beano's Avatar
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    How many Kilometers has the car / gearbox traveled, Chadi ?

    Some Peugeot repairers here used to put in gearbox oil as the cars got older.

    I am sure this has been discussed here previously, and I'm sure there were answers from members who know a lot more about gearboxes and oil than I do, but I have not done a thread search yet.

  7. #7
    1000+ Posts bluey504's Avatar
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    Chadi, if the 10W40 is semi-synthetic it will be fine. It is probably only 25% synthetic so no biggie (however semi to my mind means half and therefore 50%) and this from Oil companies specifications.
    Brendan.

  8. #8
    Fellow Frogger! Ikenna351's Avatar
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    I don't think 20w-50 oil grade will have adverse effect on manual gearboxes of such era, like the one in 504s & 505s. Worse case, they become noisier (probably won't happen). But since it's mineral oil, the change interval will reduce.

    Ikenna351, Lion King - Monk.

  9. #9
    Fellow Frogger! Doush_504's Avatar
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    Quote Originally Posted by Beano View Post
    How many Kilometers has the car / gearbox traveled, Chadi ?

    Some Peugeot repairers here used to put in gearbox oil as the cars got older.

    I am sure this has been discussed here previously, and I'm sure there were answers from members who know a lot more about gearboxes and oil than I do, but I have not done a thread search yet.
    266 k kms
    I am not looking for "thicker" oil at all.
    I am just looking for better protection & longevity.
    Chadi

    1982 504 SR white manual sedan with A/C (266 000 Km)
    2012 308 1.6 VTi Vapor Grey manual H/B (52000 Km)
    1994 405 1.6 white manual sedan (236 000 Km)
    1992 605 SV24 (91 000 Km)
    2005 406 2.0L automatic (Replaced with a 2013 C5)
    1983 505 GR white manual sedan with A/C (170000 Km)

    All since new


  10. #10
    Fellow Frogger! Doush_504's Avatar
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    Quote Originally Posted by Ikenna351 View Post
    I don't think 20w-50 oil grade will have adverse effect on manual gearboxes of such era, like the one in 504s & 505s. Worse case, they become noisier (probably won't happen). But since it's mineral oil, the change interval will reduce.

    Ikenna351, Lion King - Monk.
    I think it would be too thick.
    The reason I chose the 75w90 is that is has almost the same viscosity (or a tiny bit lower acutally) than the Liqui moly 10w40 I have been using for years.
    But gearbox oil will have the necessary additive package to focus on protecting the brass parts (do we have yellow brass synchros ?) in the gearbox.
    Not looking at all to use heavier or thicker oil.
    Chadi

    1982 504 SR white manual sedan with A/C (266 000 Km)
    2012 308 1.6 VTi Vapor Grey manual H/B (52000 Km)
    1994 405 1.6 white manual sedan (236 000 Km)
    1992 605 SV24 (91 000 Km)
    2005 406 2.0L automatic (Replaced with a 2013 C5)
    1983 505 GR white manual sedan with A/C (170000 Km)

    All since new


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