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Thread: Penrite 80-140 gear box oil

  1. 16th October 2021, 07:34 AM #1
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    laney
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    Penrite 80-140 gear box oil

    Hi all has any one used the penrite 80-140 oil in there R380 or is this to heavy the oil was recently replaced by a Land Rover specialist but I don't know what oil he used I prefer synthetic oil so I was going to replace it any input would be great.
    Thanks Phil
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  2. 16th October 2021, 08:11 AM #2
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    I could be wrong, but thats way to heavy, probably only used in a Salisbury diff on a land rover
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  3. 16th October 2021, 09:04 AM #3
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    I think for penrite, transgear 75w-80 is the go for r380
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  4. 16th October 2021, 09:30 AM #4
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    Quote Originally Posted by Patrick110td5 View Post
    I think for penrite, transgear 75w-80 is the go for r380
    75-80(5) is fine in cooler climes ime

    75-90 in warmer climes

    85-140 salisbury diff

    85-90 rover diff
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  5. 16th October 2021, 10:10 AM #5
    Kaaaiju
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    I use motul pro gear oil 75w-80 $45 a Liter and it's been great in my Ashcroft r380
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  6. 16th October 2021, 01:32 PM #6
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    80 - 140 in a R380 box could you even change gears while cold?

    Others have well covered this..
    *I use Penrite Pro Gear 75W90 or problematic boxes 70W75
    Regards
    Daz

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  7. 16th October 2021, 01:59 PM #7
    discorevy
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    As above , but make sure the 75-90 is gl-4 in the gearbox. I've seen the result on brass syncros with gl-5
    I was using motul gear 300 in the r380's but have recently ( since they released it) switched to penrite gl-4 75-90 , can't tell the difference shift wise and easier to get.

    Penrite Pro Gear Oil 75W-90 GL-4 2.5 Litre | Supercheap Auto
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  8. 16th October 2021, 05:54 PM #8
    mylesaway
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    Quote Originally Posted by discorevy View Post
    As above , but make sure the 75-90 is gl-4 in the gearbox. I've seen the result on brass syncros with gl-5
    I was using motul gear 300 in the r380's but have recently ( since they released it) switched to penrite gl-4 75-90 , can't tell the difference shift wise and easier to get.

    Penrite Pro Gear Oil 75W-90 GL-4 2.5 Litre | Supercheap Auto
    Do you recommend the Pro Gear for Transfer case and Diffs?

    I have been using the Trans Gear (semi-synth) which is GL-4.

    The container sizes for the Pro Gear go from 2.5l to 20l so I'll probably have to hit up my Penrite guy for a good price on a 20l.
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  9. 16th October 2021, 10:53 PM #9
    discorevy
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    Quote Originally Posted by mylesaway View Post
    Do you recommend the Pro Gear for Transfer case and Diffs?

    I have been using the Trans Gear (semi-synth) which is GL-4.

    The container sizes for the Pro Gear go from 2.5l to 20l so I'll probably have to hit up my Penrite guy for a good price on a 20l.
    As far as I know, the 75-90 trans gear is still GL-5 , I'd keep using it for the transfer case and diffs.
    Also still a good choice for truetrac / ashcroft torque biasing diff centres.
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  10. 17th October 2021, 12:28 PM #10
    mylesaway
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    Quote Originally Posted by discorevy View Post
    As far as I know, the 75-90 trans gear is still GL-5 , I'd keep using it for the transfer case and diffs.
    Also still a good choice for truetrac / ashcroft torque biasing diff centres.
    Yes, you are correct. I was thinking of Trans gear 75-80 which is available as GL-4.

    I have just checked and I have in fact been using Valvoline Duragear 75-90 which is GL-5 (as specified the RAVE Ops manual).

    My oil guy changed from Valvoline to Penrite, so have followed him over. Both good oils in my book...

    I'll check pricing for Pro-gear v Trans-gear when I buy for my next oil change. Good to see Pro-gear is available in 75w-90 GL-5.

    cheers..
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