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Help with transfer case oil

Discussion in '2nd Gen. Tacomas (2005-2015)' started by acparker12, Apr 21, 2022.

  1. Apr 21, 2022 at 10:11 AM
    #1
    acparker12

    acparker12 [OP] Well-Known Member

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    Hey everyone, I order some Mobil 1 75w-90 for my front and rear diff to do myself. But I am wondering what I should use for the transfer case. I read a lot but just want an updated thread of choosing the correct oil, my manual stats 75w-90 gl4 or gl5. Should I just use the Toyota transfer oil that’s 75w? Or can I use the Mobil 1 that I’m using for front and rear diff? Also should I use gl4 or gl5? Sorry but need some help and some clarification on this beat up question. Sorry just wanna make sure. Thanks
     
  2. Apr 21, 2022 at 10:13 AM
    #2
    Thomas Jefferson

    Thomas Jefferson Keyboard Warrior

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    One can never have too many light bars.
    It's the same oil that you use for your differentials.
     
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  3. Apr 21, 2022 at 10:19 AM
    #3
    Dm93

    Dm93 Test Don't Guess

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    While you probably won't hurt anything using a slightly different weight oil I would reccomend going with the manufacturer reccomended weight & grade of oil (75W-85 GL5 for the diffs and 75W-90 GL 4 Or 5 for the transfer case and manual transmission)
     
  4. Apr 21, 2022 at 11:08 AM
    #4
    Dalegribble02

    Dalegribble02 Well-Known Member

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    I use 75- 90 for everything good enough
     
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  5. Apr 21, 2022 at 11:11 AM
    #5
    TnShooter

    TnShooter The TacomaWorld Stray

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    Weird Toyota changed the fluid viscosity at some point?
    My 07’ say 75w-90 is good for the Front.
    Yet the 2014 calls for 75w-85?

    Anyway, I didn’t run either one in the front diff.
    But did use 75w-90 in the Transfer case. No idea what GL rating. Didn’t even look?

    78405F39-DCCA-4E04-9D55-CA34BF52A037.jpg A714FE90-B037-464C-B86A-772540C8E9EC.jpg
     
  6. Apr 21, 2022 at 11:15 AM
    #6
    Supr4Lo

    Supr4Lo Well-Known Member

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    Look at Redline MT-LV for the transfer case. I would advise against using any GL5 spec oil, there is a brass synchro in the transfer case. GL5 oils can degrade yellow metals over time.
     
  7. Apr 21, 2022 at 11:23 AM
    #7
    acparker12

    acparker12 [OP] Well-Known Member

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    Still figuring it out…
    It’s an automatic, don’t think I could use the MT
     
  8. Apr 21, 2022 at 11:25 AM
    #8
    acparker12

    acparker12 [OP] Well-Known Member

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    Still figuring it out…
    I live in PA so I don’t know if the 75w-90 or 85 would be better or just stick the weight it calls for in manual,I was thinking that but after reading everyone uses 75w-90…..
     
  9. Apr 21, 2022 at 11:25 AM
    #9
    Supr4Lo

    Supr4Lo Well-Known Member

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  10. Apr 21, 2022 at 11:27 AM
    #10
    MSgt O

    MSgt O Well-Known Member

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    I live in Michigan and used 75-90 in all
     
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  11. Apr 21, 2022 at 11:33 AM
    #11
    Hook78

    Hook78 Well-Known Member

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    My 2015 manual actually states GL-5 only for the transfer case.
     
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  12. Apr 21, 2022 at 11:52 AM
    #12
    TnShooter

    TnShooter The TacomaWorld Stray

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    I can tell you that I haven’t had any issues running 80w-90 in the rear diff.
    Well, other than a leaking axle seal. But I don’t not think that’s what cursed the leak.
    I think the rear breather being stopped up caused that issue.

    As for the front, wellllllll…….
    Let’s just say I had issues. But I am running 85w-140
    And that’s a different story. Had I to do it over, I’d went 75w-90
     
  13. Apr 21, 2022 at 11:53 AM
    #13
    Supr4Lo

    Supr4Lo Well-Known Member

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    Redline MT-90 is a 75w-90 GL4 that would work also. Since you said in the op the manual lists GL4 or GL5. I'd still recommend GL4 for my reason listed above. I'm just giving you some options.
     
    Last edited: Apr 21, 2022
  14. Apr 21, 2022 at 1:10 PM
    #14
    acparker12

    acparker12 [OP] Well-Known Member

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    Still figuring it out…
    Another thing is the transfer case drain/fill plugs the same as the front diff?
     
  15. Apr 21, 2022 at 1:40 PM
    #15
    TnShooter

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    I don’t know for sure. It’s been awhile since I did mine.
    I have an extra set of washers for the transfer case sitting here. They definitely don’t look like the crush style you use in the front differential.

    These are solid.
     
  16. Apr 21, 2022 at 1:45 PM
    #16
    joeyv141

    joeyv141 Well-Known Member

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    If memory serves rear diff and transfer case and 24mm, front diff is 10mm allen.
    I just use the same gear oil in transfer case and both diffs, lsd additive in rear diff.
     
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  17. Apr 21, 2022 at 3:42 PM
    #17
    01 dhrracer

    01 dhrracer Well-Known Member

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    My 2011 states GL4 or GL5 for transfer case.
     
  18. Apr 21, 2022 at 3:44 PM
    #18
    01 dhrracer

    01 dhrracer Well-Known Member

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    Where did you come up with this?
     
  19. Apr 21, 2022 at 3:53 PM
    #19
    XSplicer62

    XSplicer62 Well-Known Member

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    Our 2005 has been running Mobil 1 75W-90 in all three boxes since their first oil change. No issues at all.
     
  20. Apr 21, 2022 at 3:59 PM
    #20
    Supr4Lo

    Supr4Lo Well-Known Member

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    That info has been around for as long as I can remember. Just Google gl5 on brass. Not sure but maybe that's why the 3rd gen's now spec GL4. All 3 of the generations transfer cases are almost identical internally. I've had them all apart...

    But hard to argue when there are trucks out there with 100's of thousands of miles.
     

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