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Rear diff fluid change mishap?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by xxaarraa, Dec 27, 2011.

  1. Dec 27, 2011 at 12:22 PM
    #1
    xxaarraa

    xxaarraa [OP] Well-Known Member

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    Hey guys,

    I did my 30k service today and replaced all the diff fluids - rear, t-case and front. Everything went well and I replaced with Mobil 1 full synthetic fluid (75-90). But... after doing the rear, I went to empty the old fluid into the empty Mobil 1 containers and noticed one of them said 75-140 and two of them said 75-90.

    I totally didn't catch the difference in weight so my rear now has 2 quarts of 75-90 and one quart 75-140, though all of them are Mobil 1 full synthetic "LS" formula. Will this be a problem?
     
  2. Dec 27, 2011 at 12:24 PM
    #2
    Sunner

    Sunner Well-Known Member

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    I would just redo it, subbed for input though.
     
  3. Dec 27, 2011 at 12:25 PM
    #3
    BlueT

    BlueT Well-Known Member

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    Nope you 100% good, nothing to worry. I mix mines on other trucks no issue:thumbsup:.
     
  4. Dec 27, 2011 at 12:25 PM
    #4
    cc350

    cc350 Buckeye Member

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    OK to go..
     
  5. Dec 27, 2011 at 12:27 PM
    #5
    OffroadToy

    OffroadToy This ain't Dodge City, and you ain't Bill Hickok

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    I'd empty it and put in the correct weight.
     
  6. Dec 27, 2011 at 12:39 PM
    #6
    fireturk41

    fireturk41 I like to break shit!

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    my axle leaks so bad i just replace it whatever weight fluid i have haha
     
  7. Dec 27, 2011 at 12:50 PM
    #7
    ManMan

    ManMan Well-Known Member

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    With that mix you're effectively running 75w107. Not a big deal, I'd just go with it. Last time I worked on an axle, everything in there was roller bearings which really don't care what lube they have. The only critical tolerances were gear lash and side to side preload ... neither of which are really going to be affected by the oil weight. It's not like there are journal bearings with critical tolerances
     
  8. Dec 27, 2011 at 12:51 PM
    #8
    jeremy_283

    jeremy_283 Super Member

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    I'd do it the right way, and always check bottle labels :D
     
  9. Dec 27, 2011 at 12:53 PM
    #9
    ruggedT

    ruggedT The Sticker Guy Vendor

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    It wont matter, your good to go
     
  10. Dec 27, 2011 at 12:56 PM
    #10
    xxaarraa

    xxaarraa [OP] Well-Known Member

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    Thank you folks! :)
     
  11. Dec 27, 2011 at 1:30 PM
    #11
    WV150

    WV150 Well-Known Member

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    Change it.Not good to mix weights.
     
  12. Dec 27, 2011 at 1:32 PM
    #12
    maxamillion2345

    maxamillion2345 Go home if you don't like guns liquor and whores.

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    Too many
  13. Dec 27, 2011 at 1:42 PM
    #13
    Sunner

    Sunner Well-Known Member

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    A couple mixed reviews, personally Ide change it out just to be on the safe side but doesnt seem needed given a few of the reasons provided above.
     
  14. Dec 27, 2011 at 2:10 PM
    #14
    BUZZCUT

    BUZZCUT Well-Known Member

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    Run it like it is.
     
  15. Jan 1, 2012 at 3:09 PM
    #15
    johnny 5

    johnny 5 Well-Known Member

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    My drivline runs all Valvoline synthetic 75w90 front diff rear diff and transfer case over 100,000 no troubles yet. Piece of mind would be not to mix weights. I never mix lubricants but atleast you have the same brand
     
  16. Jan 1, 2012 at 3:21 PM
    #16
    BlueT

    BlueT Well-Known Member

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    mixing weights is standard proc. for example 75-110 is odd number but there are some diffs calling for it You get that by mixing 75-90 with 75-140 at 1:1 ratio.
     
  17. Jan 1, 2012 at 4:30 PM
    #17
    Tepidy

    Tepidy Well-Known Member

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    your good to go
     
  18. Jan 1, 2012 at 4:39 PM
    #18
    Airun

    Airun Well-Known Member

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    It'll be fine! Probably a performance upgrade.
     
  19. Jan 1, 2012 at 4:52 PM
    #19
    KenLyns

    KenLyns Lord of War

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    No problem, especially since they are all the same brand. Where do you find 75W-140? In theory it will allow the rear diff to tolerate higher temps before the oil breaks down. I only see 75W-90 in my area.
     
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