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Thread: Oil mix question

  1. 23rd August 2014, 12:27 PM #1
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    Question Oil mix question

    going to change the fluids in both transfer case and diffs on my 01 disco td5 and find that I have only a 4L container of Nulon 80W/90 gearbox & diff oil (assume its mineral oil...as nothing to state otherwise) ..but I also have a 4L container of Nulon semi-synthetic 75W/90 manual gearbox and transaxle oil. just wondering if I can safely mix the two???
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  2. 23rd August 2014, 03:20 PM #2
    ballbag
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    Yep
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  3. 23rd August 2014, 04:43 PM #3
    EvilGTV
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    Assuming they're both full containers, why would you need to mix them at all? Put one type in the diffs, put the other type in the transfer case....

    I'd probably put the semi synthetic in the transfer case myself, rover diffs are pretty old and simple technology, and gear noises etc are more audible from the transfer case.
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  4. 23rd August 2014, 04:58 PM #4
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    Quote Originally Posted by EvilGTV View Post
    Assuming they're both full containers, why would you need to mix them at all? Put one type in the diffs, put the other type in the transfer case....

    I'd probably put the semi synthetic in the transfer case myself, rover diffs are pretty old and simple technology, and gear noises etc are more audible from the transfer case.
    good thinking 99!!
    is'nt it silly that one (I) could so easily overlook the obvious 😨
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  5. 23rd August 2014, 07:56 PM #5
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    As noted, put the GL-5 oil into the diffs (don't put a GL-4 oil into the diffs). The transfer box can take a GL-4 or GL-5 but the additives in a GL-5 diff oil are not good for the synchros in a manual gearbox. Definitely don't mix with the diffs but could potentially mix for the transfer box.
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  6. 23rd August 2014, 08:34 PM #6
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    Quote Originally Posted by DiscoDB View Post
    As noted, put the GL-5 oil into the diffs (don't put a GL-4 oil into the diffs). The transfer box can take a GL-4 or GL-5 but the additives in a GL-5 diff oil are not good for the synchros in a manual gearbox. Definitely don't mix with the diffs but could potentially mix for the transfer box.
    thanks for the reply,
    just for interest, both oils are GL-5 ☺
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  7. 23rd August 2014, 09:14 PM #7
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    Quote Originally Posted by rapserv View Post
    thanks for the reply,
    just for interest, both oils are GL-5 ☺
    That being the case, no problems here. Semi synthetic is a blend with mineral oil already, so blending further is not a problem other than diluting the synthetic portion but as already noted no need to mix anyway.
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