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Can I use Mobil 1 75W-90 LS for transmission oil

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Shawn OT, Sep 21, 2019.

  1. Sep 21, 2019 at 2:37 PM
    #1
    Shawn OT

    #1
    Shawn OT [OP] Member

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    I'm planning to change the transmission oil on my 08 4.0 6 speed manual. I believe 75W-90 is the recommended viscosity. I recently bought
    $30 Mobil 1 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
    Mobil 1 75W-90 LS gear oil for the transfer case, and diffs and bought enough to do the tranny as well. The oil says is has a limited slip friction modifier added to the oil. Is this still ok to be used in the transmission, or should I go with something else?
     
    Shawn OT, Sep 21, 2019
    #1
  2. Sep 21, 2019 at 2:43 PM
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    FJBub

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    FJBub Well-Known Member

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    RedLine MT90 is what you seek. Lots of guys run it in their manuals. I've used it in my FJ for 12 years. Now at 232K.
     
    FJBub, Sep 21, 2019
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  3. Sep 21, 2019 at 2:48 PM
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    Lester Lugnut

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    Lester Lugnut Well-Known Member

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    Lester Lugnut, Sep 21, 2019
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  4. Sep 21, 2019 at 2:58 PM
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    0xDEADBEEF

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    0xDEADBEEF Trash Aficionado

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    I'm pretty sure you do not want limited slip modifier in your MT.

    I have redline in my nissan, it shifts great. The first time i changed it i used some oil that supposedly met the spec and it was awful.
     
    0xDEADBEEF, Sep 21, 2019
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  5. Sep 21, 2019 at 4:11 PM
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    sparkystaco

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    sparkystaco Well-Known Member

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    LS gear oil is fine to run in mt's.
     
    sparkystaco, Sep 21, 2019
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  6. Sep 22, 2019 at 5:56 AM
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    Shawn OT

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    Shawn OT [OP] Member

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    Shawn OT, Sep 22, 2019
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  7. Sep 23, 2019 at 9:07 AM
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    Collins

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    Collins Well-Known Member

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    The M1 75W90LS is GL-4 and GL-5 rated and is probably fine. I debated on using that in my 5spd as i had several quarts of it in the stash,
    but I went with the RedLine MT90 for ease of mind.

    No issues so far.

    Good Luck with it.
     
    Collins, Sep 23, 2019
    #7
  8. Sep 23, 2019 at 10:35 AM
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    DGXR

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    DGXR Well-Known Member

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    If the transmission is not spec'd for LS fluid, I would not use it. I don't think it's worth the potential problems, which could be serious. So just spend the extra $25 and get the right product. You will eventually use the extra LS fluid for its intended application. I was told I can use LS fluid in my open differential but I don't think that means it's OK for all gearboxes.
     
    DGXR, Sep 23, 2019
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  9. Sep 23, 2019 at 12:49 PM
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    Shawn OT

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    Shawn OT [OP] Member

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    Thanks for all the input, I ordered Redline MT-90.
     
    Shawn OT, Sep 23, 2019
    #9
    FJBub likes this.

Products Discussed in

Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
$29.67
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