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Thread: Gearbox oil

  1. 15th June 2007, 09:43 AM #1
    PAT303
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    Gearbox oil

    I know this has been done to death but my gearbox has always had ATF in it but after reading about it everyone is of the opionion that light gear oil is the better bet.So I filled it with Penrite oil that is recommended by them,light synthetic and this morning I couldn't change gear while it was cold.After a few km's it was OK but using only 2nd and 4th every morning going to get a bit anoying.I for one will be going back. Pat
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  2. 15th June 2007, 11:06 AM #2
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    isuzurover
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    Which penrite oil did you use?
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  3. 15th June 2007, 11:45 AM #3
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    I use the Penrite 75W-80 in my LT77, and it's beaut once it's warm. I do have to be gentle for the first few minutes. The previous owner's garage used Valvoline (I think) Duragear, but when I did the first change from it to the Penrite I noticed warm changes were much better.
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  4. 15th June 2007, 12:01 PM #4
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    Castrol Syntrans in an LT77. I use that now and when I swapped over from ATF, the shift quality improvement was very noticeable.
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  5. 15th June 2007, 12:04 PM #5
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    I am currently using VMX80 - but will be swapping to Syntrans tonight!
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  6. 15th June 2007, 01:30 PM #6
    PAT303
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    It's there light gearbox oil.It has for use were ATF was the original spec lube as in saab's,LandRovers etc.When it is hot it is fine but when cold no good. Pat
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  7. 15th June 2007, 01:55 PM #7
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    ladas
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    I cannot find any data on a 'light' synthetic oil from Penrite ?

    Does it actually have a product name?
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  8. 15th June 2007, 02:19 PM #8
    Pavo
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    Quote Originally Posted by ladas View Post
    I cannot find any data on a 'light' synthetic oil from Penrite ?

    Does it actually have a product name?
    I know he hasn't mentioned the exact name yet, but I would guess he's talking about Manual Gear Oil 75. He's given enough hints like "saabs. land rovers" which is in Penrite's pdfs. I just noticed on Penrite's website that they have a Manual Gear Oil 70 now which is a 70W-75 (they say is suited for Disco 3), while the Manual Gear Oil 75 is a 75W-80 (which they recommend for R380s).

    I have 2 2.5L bottles of Manual Gear Oil 75 at home, but I've never tried it. I have SynTrans at the moment and it seems really good, but if it's really cold it's a bit notchy going into 2nd from 1st generally on the first 2 shifts or so and then it's good.

    Pete
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  9. 15th June 2007, 02:26 PM #9
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    PAT - I assume you used the Syngear 75/90?

    It seems to be a bit viscous. For example - Syntrans 75/85 has about a 40% lower viscosity at any given temperature.

    As mentioned above - the box may be a biit notchy for the first 1-2 shifts, but it will have better protection in the long run - and where it counts - at high temperatures working hard.
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  10. 15th June 2007, 02:40 PM #10
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    Quote Originally Posted by isuzurover View Post
    PAT - I assume you used the Syngear 75/90?

    It seems to be a bit viscous. For example - Syntrans 75/85 has about a 40% lower viscosity at any given temperature.

    As mentioned above - the box may be a biit notchy for the first 1-2 shifts, but it will have better protection in the long run - and where it counts - at high temperatures working hard.
    Sorry but how do you figure this, the figures 75/85 are the viscosity range

    So if you take any 75/85 lubricant and matched it against temperature (in the same range) you would have a very similar viscosity curve (even though on most it's a straight line)

    Or did I miss something ?
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