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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

    #1
    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?
     
    xxaarraa, Dec 27, 2011
    #1
  2. Dec 27, 2011 at 12:24 PM
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    Sunner

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    Sunner Well-Known Member

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

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    BlueT Well-Known Member

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

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    cc350 Retired Member

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    OK to go..
     
    cc350, Dec 27, 2011
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  5. Dec 27, 2011 at 12:27 PM
    #5
    OffroadToy

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    OffroadToy old, forgetful, and decomposing

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

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    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
     
    fireturk41, Dec 27, 2011
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  7. Dec 27, 2011 at 12:50 PM
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    ManMan

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    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
     
    ManMan, Dec 27, 2011
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  8. Dec 27, 2011 at 12:51 PM
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    jeremy_283

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    jeremy_283 Super Member

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    I'd do it the right way, and always check bottle labels :D
     
    jeremy_283, Dec 27, 2011
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  9. Dec 27, 2011 at 12:53 PM
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    ruggedT

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    ruggedT The Sticker Guy

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

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    xxaarraa [OP] Well-Known Member

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

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    Change it.Not good to mix weights.
     
    WV150, Dec 27, 2011
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  12. Dec 27, 2011 at 1:32 PM
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    92LandCruiser

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    92LandCruiser Well-Known Member

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    Run it.
     
    92LandCruiser, Dec 27, 2011
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  13. Dec 27, 2011 at 1:42 PM
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    Sunner

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    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.
     
    Sunner, Dec 27, 2011
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  14. Dec 27, 2011 at 2:10 PM
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    BUZZCUT

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    BUZZCUT Well-Known Member

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    Run it like it is.
     
    BUZZCUT, Dec 27, 2011
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  15. Jan 1, 2012 at 3:09 PM
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    johnny 5

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    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
     
    johnny 5, Jan 1, 2012
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  16. Jan 1, 2012 at 3:21 PM
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    BlueT

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    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.
     
    BlueT, Jan 1, 2012
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  17. Jan 1, 2012 at 4:30 PM
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    Tepidy

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    Tepidy Well-Known Member

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

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    Airun Well-Known Member

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    Airun, Jan 1, 2012
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  19. Jan 1, 2012 at 4:52 PM
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    KenLyns

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    KenLyns 8.75" Third Member

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    KenLyns, Jan 1, 2012
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Products Discussed in

Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
$29.67
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