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Is synthetic oil in the REAR differential ok?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TacoTakeover, Mar 17, 2015.

  1. Mar 17, 2015 at 8:27 AM
    #1
    TacoTakeover

    TacoTakeover [OP] Well-Known Member

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    Or would y'all stick to regular for the rear? I read somewhere on here that some people avoid putting synthetic only in the rear for some reason. I was planning on doing mobil 1 synthetic 75w-90 in the front, TC, and rear but now I'm not sure about the rear. Thanks!
     
  2. Mar 17, 2015 at 8:31 AM
    #2
    CRU

    CRU Well-Known Member

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    I read that a while back as well. IRC, supposedly the synthetic oil can cause vibrations in the rear.
     
  3. Mar 17, 2015 at 8:34 AM
    #3
    TacoTakeover

    TacoTakeover [OP] Well-Known Member

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    YES! Now that you've said that, that's exactly what I remember reading now!
     
  4. Mar 17, 2015 at 8:42 AM
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    Bellis

    Bellis friggin rad

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    x2 my 2012 is fine with synthetic in the rear, no mechanical LSD no problem
     
  5. Mar 17, 2015 at 8:52 AM
    #5
    PCTaco

    PCTaco 36 hour Build

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    Running Amsoil 75w90 in my rear without any problems.
     
  6. Mar 17, 2015 at 8:53 AM
    #6
    OffsetPlayer2

    OffsetPlayer2 Cornbread fed

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    x3 my 2011 had no problems with running synthetic in the rear. Check the rear diff and if you see a sticker that says to add the LSD stuff then you may want to pick up a tube.
     
  7. Mar 17, 2015 at 8:58 AM
    #7
    TacoTakeover

    TacoTakeover [OP] Well-Known Member

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    Ahhh thanks for clearing that up! I have a 2013 Sport so I believe I have auto LSD and don't need the LS additive. So I should be ok with synthetic in the rear.
     
  8. Mar 17, 2015 at 9:27 AM
    #8
    TacoTakeover

    TacoTakeover [OP] Well-Known Member

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    Yes thanks, Chris verified that for me yesterday. So will probably just use mobil 1 LS 75w-90 for all and if I can't find it I will then go with Amsoil or RP.
     
  9. Mar 17, 2015 at 9:32 AM
    #9
    KenLyns

    KenLyns 8.75" Third Member

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    I had Castrol synth 75W90 in the rear diff before and occasionally got some chatter (non-LSD rear diff). The chatter is reduced after switching to Quaker State synth 75W140.
     
  10. Mar 17, 2015 at 12:40 PM
    #10
    qnyla

    qnyla Well-Known Member

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    I have run synthetic in the diffs for 383k miles without problem.

    Red Line 75W85 or Amsoil Severe Gear 75W90.
     
  11. Mar 17, 2015 at 12:44 PM
    #11
    Cmurder

    Cmurder 2011 TX TRD Offroad

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    383k miles! Synthetic works and theres your answer.
     
  12. Mar 17, 2015 at 1:35 PM
    #12
    Therealwinshady

    Therealwinshady Well-Known Member

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    nothing wrong with mine, 30k ago i switched.
     
  13. Mar 17, 2015 at 1:41 PM
    #13
    Snowman

    Snowman I have a problem for your solutionÂ…

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    My manual calls for 75w90 I believe, and I have never seen 75w90 in non-synthetic (although I'm sure someone makes it somewhere) so I would say it works just fine.
     
  14. Mar 17, 2015 at 2:22 PM
    #14
    Janster

    Janster Old & Forgetful

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    Confirmed.

    I have an 07 with mechanical LSD. I have Mobile 1 75W-90 in the rear and have had to use 1 3/4bottles of XL3 (Ford) friction modifier to prevent the rumbles. :thumbsup:
     

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