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Gear Oil- 80w-90 vs 75w90

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TacomaMike37, Apr 6, 2018.

  1. Apr 6, 2018 at 8:08 AM
    #1
    TacomaMike37

    TacomaMike37 [OP] Well-Known Member

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    Background: Only have 23K on my truck , but its almost 5 years old, so next weekend will be changing fluids on both differentials and the transfer case.

    Having a real hard time finding 75w-90, but 80w-90 is everywhere.

    No biggie using the 80w-90 for all three changes right?

    Thanks.
     
  2. Apr 6, 2018 at 10:06 AM
    #2
    rob1208

    rob1208 Well-Known Member

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    I just used Lucas 80-90 regular (not synthetic) and from what i read on here, it’s totally fine
     
    TacomaMike37 [OP] likes this.
  3. Apr 6, 2018 at 10:30 AM
    #3
    REDdawn6

    REDdawn6 Well-Known Member

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  4. Apr 6, 2018 at 10:31 AM
    #4
    REDdawn6

    REDdawn6 Well-Known Member

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    I went to Pep Boys and they had Mobil 1 75-90 synthetic for like $11ea...
     
  5. Apr 6, 2018 at 10:40 AM
    #5
    BillsSR5

    BillsSR5 Looking out for #1

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    no biggie, but you might see a hit on the MPGs not too much cause 80w90 usually a DINO oil will have a thicker viscosity range than the full synthetic 75w90. the manual calls for a super thin 75w85 GL5 which has a very low/thin viscosity range at certain temps. mainly for getting the best MPGs. personally I would try to get a 75w90 gl5 full synthetic like Valvoline Syn 75w90 it has a closer/closest ive seen viscosity range to the Toyota rec'd 75w85 but will give better protection.
     
  6. Apr 6, 2018 at 12:25 PM
    #6
    TacomaMike37

    TacomaMike37 [OP] Well-Known Member

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  7. Apr 6, 2018 at 12:42 PM
    #7
    Zacowacko

    Zacowacko Well-Known Member

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  8. Apr 6, 2018 at 1:12 PM
    #8
    peteyfresh

    peteyfresh Well-Known Member

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    80w/90 in the rear diff, 75w/90 sythetic in the t-case and front diff. 75w/90 is ok in the rear diff too. But don't put 80w/90 in the t-case or front diff.
     
  9. Apr 6, 2018 at 1:15 PM
    #9
    peteyfresh

    peteyfresh Well-Known Member

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    Forgot to add if you have the LSD rear end use 75w/90 and add limited slip additive
     
  10. Apr 6, 2018 at 1:18 PM
    #10
    nd4spdbh

    nd4spdbh Well-Known Member

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  11. Apr 6, 2018 at 1:25 PM
    #11
    TacomaMike37

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  12. Apr 6, 2018 at 2:10 PM
    #12
    nd4spdbh

    nd4spdbh Well-Known Member

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    You sure can, it wont harm anything in the tcase / diffs by having it.

    Its exactly what i run in my truck in all 3 spots, never an issue.
     
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  13. Apr 6, 2018 at 3:48 PM
    #13
    BillsSR5

    BillsSR5 Looking out for #1

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    you wont need LSD additive for your year MOBIL1 is fine to use
     
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  14. Apr 18, 2018 at 1:13 PM
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    Bravisimo

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  15. Apr 18, 2018 at 1:17 PM
    #15
    Matermax

    Matermax Well-Known Member

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    Why no 80w/90 in the t-case or front diff?
     
  16. Apr 18, 2018 at 1:39 PM
    #16
    TacomaMike37

    TacomaMike37 [OP] Well-Known Member

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    Guy doesnt know what he's talking about.

    Ill be using 80w90 when I do my change I wasnt going to drop $10 a qt for 75w90 when I could get the 80w90 for a third the cost.

    I read and read. Lots of owners use 80w90 vs 75w90. At the end of the day its gear oil.
     
  17. Apr 18, 2018 at 1:45 PM
    #17
    BillsSR5

    BillsSR5 Looking out for #1

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    its kinda of like motor oil there really isn't any best, there is what the manufactorer recommends weight, GL4 or GL5, what your willing to pay. the best oil is the one that gets changed at the manufactorers recommended OCI and is at the manufactorers rec'd viscosity.
     
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  18. Apr 18, 2018 at 1:58 PM
    #18
    Bravisimo

    Bravisimo So many mods, very little money.

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    cool thanks. :thumbsup:
     
  19. Apr 18, 2018 at 2:20 PM
    #19
    MolonLabeTaco

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  20. Apr 18, 2018 at 2:52 PM
    #20
    Lester Lugnut

    Lester Lugnut Well-Known Member

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    Last edited: Apr 18, 2018

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