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Rear Diff fluid

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TacoBob2008, Feb 8, 2017.

  1. Feb 8, 2017 at 11:41 AM
    #1
    TacoBob2008

    TacoBob2008 [OP] Member

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    Hey,

    I have a 2008 4x4 V6 SR5 Tacoma and am planning on changing my rear diff oil in the next few days.

    Right now I purchased 3 quarts of 75-W90 Royal Purple Gear oil with limited slip additive.

    The owners manual recommends 80W-90, is the 75W-90 with additive a better oil to use, or should I return it for 80W-90 and add the additive between the first and second quart?


    Thanks for your help Bob.
     
  2. Feb 8, 2017 at 11:45 AM
    #2
    DGXR

    DGXR Well-Known Member

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    75w90 is fine, not better or worse than 80w90 and surely good enough, especially since you are using a premium brand. Tons of us here on TW have used 75w90 without issues. Besides, there is virtually no difference in viscosity between 75w90 and 80w90.
     
    Norton likes this.
  3. Feb 8, 2017 at 11:49 AM
    #3
    NAAC3TACO

    NAAC3TACO Middle aged member

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    75W90 is fine, but you don't need the limited slip additive unless you have a TRD Sport. BTW, welcome to TW!
     
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  4. Feb 8, 2017 at 11:55 AM
    #4
    TacoBob2008

    TacoBob2008 [OP] Member

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    Ok cool thanks for the quick replies!
     
  5. Feb 8, 2017 at 11:58 AM
    #5
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Unexceptional
    I run 75W90 Redline GL-5 gear oil (which has limited slip additive) in my truck's transfer case and both axles and 75W90 MT90 GL-4 in my transmission.
     
  6. Feb 8, 2017 at 12:48 PM
    #6
    TacoBob2008

    TacoBob2008 [OP] Member

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    Would using the oil with the limited slip additive cause problems if I don't need it?
     
  7. Feb 8, 2017 at 12:55 PM
    #7
    dkoester89

    dkoester89 Active Member

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    How often do you usually change the diff fluid?
     
  8. Feb 8, 2017 at 12:59 PM
    #8
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Unexceptional
    I'm only aware of two problems with having friction modifiers in gear oil when you don't need it. One is it's usually not compatible with manual transmissions and generally speaking will break down faster than gear lube without it.
     
  9. Feb 8, 2017 at 1:09 PM
    #9
    TacoBob2008

    TacoBob2008 [OP] Member

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    Trailer Brake system, Bilstein 5100 Rear Shocks, Tonneau cover, Toyota replaced rear leafs
    Ok, I will go grab some without it.

    I try to change it every 30 000 km but have gone a bit longer this time around.
     
  10. Feb 9, 2017 at 11:59 AM
    #10
    DGXR

    DGXR Well-Known Member

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    I change mine every 60,000 miles with synthetic 75w90, but also my truck has a pretty easy life, nothing too severe.
    If I were towing or hauling regularly, I would do 40,000 mile differential service. Mine is an open differential.
     
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  11. Feb 9, 2017 at 12:01 PM
    #11
    HomerTaco

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    Lucas 85w140 here. This is recommended by ECGS
     
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  12. Feb 9, 2017 at 12:03 PM
    #12
    ZachPrerunner

    ZachPrerunner Sometimes she goes, sometimes it doesn’t

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    Lucas 75w90 here. No problems thus far.
     
  13. Feb 9, 2017 at 12:05 PM
    #13
    mightytacoman

    mightytacoman Mighty-known Member

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    When talking to 4wd parts about what weight to use, they said 85w/140 is what they use to break in the gears and afterwards its okay to use the thinner 75w/90. I wonder if ECGS is thinking along the same lines. ECGS warranties their stuff so of course they are gonna want the heavier stuff in as it offers more protection.
     
  14. Feb 9, 2017 at 12:10 PM
    #14
    DGXR

    DGXR Well-Known Member

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    This is a perfect example: heavier weight oil does not necessarily mean more protection from wear. Often, thinner oils can provide superior film strength over heavier oils, it all depends on the performance of the oil, high load testing results, etc.
     
  15. Feb 9, 2017 at 12:14 PM
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    HomerTaco

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    Shits like molasses.
     
  16. Feb 9, 2017 at 1:19 PM
    #16
    TacoBob2008

    TacoBob2008 [OP] Member

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    Ok so I returned the Royal Purple And picked up so motomaster 80W-90 GL 5 gear oil.

    I'm a believer that you get what you pay for most of the time and this oil is only $7 a quart.

    So unless I can find 80W-90 synthetic gear oil I'm probably going to get 75W-90 synthetic GL5 and use that.
     
  17. Feb 11, 2017 at 11:06 AM
    #17
    j.claw

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    Question regarding the LS additive and our differentials - are the only two diff options: open with locker, or a limited slip diff? Were there any 4x4 models produced with an open rear diff?

    EDIT: or going off this thread, post 9, are the base 4x4 open? https://www.tacomaworld.com/threads/toyota-limited-slip-differential.79912/
    END EDIT

    I have a 2007 base regular cab 4x4 MT and want to get the right stuff. Owner's manual of limited use as it applies to all models.
     
    Last edited: Feb 11, 2017
  18. Feb 11, 2017 at 3:00 PM
    #18
    NAAC3TACO

    NAAC3TACO Middle aged member

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    A 2007 base 4x4 would have an open diff. 2005 to 2008 TRD Sports have limited slip, TRD Off Roads had an electric locker.
     
  19. Feb 11, 2017 at 3:06 PM
    #19
    kodiakisland

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    Same
     
  20. Feb 11, 2017 at 3:17 PM
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    Mush Mouse

    Mush Mouse Club Soda Not Seals

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