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Gear Oil?

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

  1. Aug 21, 2022 at 1:27 PM
    #1
    ICECOLDBEER

    ICECOLDBEER [OP] Well-Known Member

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    Does the viscosity matter for rear diff oil? My manual states:
    Front Diff: SAE 75w-90
    Rear: Above 0 degrees F- SAE 90
    Below: 0 degrees F- 80w-90 or SAE 80W.

    All I can find locally is 75w-90 and 80w-90.
    Thoughts? We get below 0F a couple times a year.
     
    Last edited: Aug 21, 2022
  2. Aug 21, 2022 at 1:46 PM
    #2
    ICECOLDBEER

    ICECOLDBEER [OP] Well-Known Member

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    Actually all I can see locally is the 80w-90.
     
  3. Aug 21, 2022 at 1:49 PM
    #3
    Key-Rei

    Key-Rei Well-Known Member

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    tacoman45, NAAC3TACO and Chris(NJ) like this.
  4. Aug 21, 2022 at 1:52 PM
    #4
    ICECOLDBEER

    ICECOLDBEER [OP] Well-Known Member

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    Last edited: Aug 21, 2022
  5. Aug 21, 2022 at 2:06 PM
    #5
    3JOH22A

    3JOH22A Toyota Gigolo

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  6. Aug 21, 2022 at 2:07 PM
    #6
    Key-Rei

    Key-Rei Well-Known Member

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    Royal Purple is pretty decent, IIRC the rear calls for closer to 3 or 4 quarts but I never go by volume, keep putting it in the fill plug hole till it just barely starts to dribble out, that's the "full" line.
     
    Chuy likes this.
  7. Aug 21, 2022 at 2:17 PM
    #7
    leid

    leid Well-Known Member

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    Last edited: Aug 21, 2022
    Key-Rei likes this.
  8. Aug 21, 2022 at 3:41 PM
    #8
    ICECOLDBEER

    ICECOLDBEER [OP] Well-Known Member

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  9. Aug 21, 2022 at 3:43 PM
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    3JOH22A

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  10. Aug 21, 2022 at 3:44 PM
    #10
    ICECOLDBEER

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  11. Aug 21, 2022 at 7:55 PM
    #11
    TnShooter

    TnShooter The TacomaWorld Stray

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    75w-90 or 80w90 will be fine.
    They are both a 90 weight oil.

    The only difference is how they flow cold.
    And the differential won’t stay cold long enough for 5w point to matter.

    I used 85w-140 in my front differential.
    If I were to do it over, I would have just used 75w-90.

    I’m using 80w-90 in my rear differential.
    We don’t get below 0. About the lowest we see is low teens.

    We might see single digit or near 0 once every 50 years.
     
    tacoman45 and Key-Rei like this.
  12. Aug 21, 2022 at 10:23 PM
    #12
    leid

    leid Well-Known Member

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    Yes, the 80W-90 is a HD dino oil. And it probably has a very similar additive package to the 85W-140 HD Lucas dino oil that ECGS thinks so highly of. Given your climate, the 80W-90 HD Lucas dino oil would be a very good choice IMO. The 85W-140 HD Lucas dino oil is what I will be picking up tomorrow for use down here in MS. I have used both Amsoil and Red Line synthetics. Both were very good gear oils.
     
  13. Aug 21, 2022 at 10:29 PM
    #13
    TnShooter

    TnShooter The TacomaWorld Stray

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    Here is my experience with the heavier oil.
    I’m not the only one to have this happen.
    If it gets below 50 degrees where you live, I’d maybe stick to 90 weight.
    https://www.tacomaworld.com/threads/front-diff-leaking-gear-oil-from-the-breather.744067/
     
  14. Aug 22, 2022 at 1:52 AM
    #14
    Chris(NJ)

    Chris(NJ) Well-Known Member

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    I have some Lucas 85-140 fs….if it’s what you’re looking for and it’ll save you a few bux…. (Although not sure w shipping)
    https://www.tacomaworld.com/threads/fluids-randoms.761843/
     
  15. Aug 22, 2022 at 5:56 AM
    #15
    muddog321

    muddog321 Well-Known Member

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  16. Aug 30, 2022 at 1:20 PM
    #16
    MVMike

    MVMike Well-Known Member

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    Just changed my 2016 rear diff oil at 95K mi. It was still clear and gold. Unlike any other disgusting stinky black gear oil Ive ever changed. Manual says GL-5 Synthetic. I went back with Mobil1 80-90W Syn. Super easy change. 4qts didn’t fill to the fill threads but I measured what came out and it was only 4qts.
     
  17. Aug 30, 2022 at 1:35 PM
    #17
    saint277

    saint277 Vigilo Confido

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    Bit of an odd article. Says lucas dino is better than synthetic oil, than says serval synthetic oils perform as good as or better than dino lucas. Interesting statement about heat and diff OCI, I had always thought that the increased resistance to flow, from a thicker oil, would increase the heat of the fluid. Guess I would need to see some data.
     
  18. Aug 30, 2022 at 3:15 PM
    #18
    muddog321

    muddog321 Well-Known Member

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    Rear Diff capacity is 3.1 qts (or when it comes out the fill plug) but not 4.
    Front Diff 1.6 qt
    Transfer Case 1.1 qt
     
  19. Aug 30, 2022 at 7:30 PM
    #19
    Nctrucknut336

    Nctrucknut336 New Member

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    I ran into this same issue on my 08 with limited slip. Lucky I found that Mitsubishi makes a SAE 90 gl5 for the evo for around $15. My truck chatters at start if I use 75-90.
     
    Extra cheesy likes this.
  20. Aug 30, 2022 at 8:22 PM
    #20
    armartin

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