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Differential additive - why?

Discussion in '3rd Gen Tundras (2014-2021)' started by swallace, Jul 21, 2021 at 11:45 PM.

  1. Jul 21, 2021 at 11:45 PM
    #1
    swallace

    swallace [OP] Insert profound statement —> here <—

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    I recently was able to get my hands on the maintenance history of my truck (I purchased it with 85k miles). At 77k miles, a Toyota dealer added differential additive and I’m trying to understand why. Is the only reason to use additive to reduce chatter if it shows up? My local dealer said they don’t recommend changing the differential fluid ever, yet this other dealer used additive…which seems like conflicting messages. It’s not really lifetime if additive needs to be put in there. Wouldn’t it be better to do a complete flush?
     
  2. Jul 22, 2021 at 12:43 AM
    #2
    Winning8

    Winning8 New Member

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    Dealers are crooks, they will sell a fridge to an eskimo, if the Eskimo don’t know better.
     
  3. Jul 22, 2021 at 12:51 AM
    #3
    AZBoatHauler

    AZBoatHauler Desert Dweller

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    Agree with ^ but the notion you should never change the diff oil is also completely illogical considering cost to service versus cost to repair/replace. I’m sure you could go a good long while on the stock fill but there comes a point where you should clean / check the magnet and make sure you don’t have any water intrusion - not to mention freshen the oil.

    If you can lay on the ground and loosen/torque a bolt you are capable of draining and filling the diff. Get some new washers from your local dealer parts counter for the drain and fill bolts and 4 qts of your favorite 75-90 gear oil spend 10 minutes watching YouTube and you’re all set. When you see how gross the oil draining is you’ll be glad you aren’t keeping it in there “forever”.
     
    2mchfun and WILLINH like this.
  4. Jul 22, 2021 at 1:00 AM
    #4
    Winning8

    Winning8 New Member

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    It’s 30-50k service, 50k if I use synthetic
     
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  5. Jul 22, 2021 at 1:07 AM
    #5
    ColoradoTJ

    ColoradoTJ So there I was.... Staff Member

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    I’m wondering why the dealership would put additive in at all anyway. What additive did they put in?
     
  6. Jul 22, 2021 at 3:22 AM
    #6
    Bammer

    Bammer I'm disinclined to acquiesce your request.

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    You need a new dealer !
     
  7. Jul 22, 2021 at 4:05 AM
    #7
    timsp8

    timsp8 Member

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    Maybe the previous owner put in an lsd. My dealer put in additive for me because I had an lsd.
     
  8. Jul 22, 2021 at 5:13 AM
    #8
    TundraMcGov.

    TundraMcGov. Your friend. Your foe. Not yo Ho.

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    When I had it done at the dealer my receipt said "blinker fluid." But it didn't specify a manufacturer or weight. Makes me sooooo mad. I don't even know if they actually did the work. Why would they use blinker fluid when I requested a differential oil change???

    Life is hard.
     
    hagrid likes this.
  9. Jul 22, 2021 at 5:54 AM
    #9
    2mchfun

    2mchfun Lead foot, left lane, loud stereo

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    Take fill plug out before you take out drain plug, always want to be sure you can fill before you drain anything.
     
  10. Jul 22, 2021 at 3:59 PM
    #10
    swallace

    swallace [OP] Insert profound statement —> here <—

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    All it says is "LTD Slip Additive". I don't know what they put in.

    The truck was basically stock when I got it. Considering it was a 4.6 and stock, I would be surprised if it had an LSD installed. How would I know if an after-market LSD was installed?
     
  11. Jul 22, 2021 at 4:02 PM
    #11
    NWPirate

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    It would be clearly labeled on the diff.
     
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  12. Jul 22, 2021 at 5:56 PM
    #12
    timsp8

    timsp8 Member

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    I think you can still check this way.

    Raise the rear axle to put both rears tires off the ground. Spin one. If they spin the same way, you have an lsd. If they spin opposite directions, open diff.
     
  13. Jul 22, 2021 at 5:57 PM
    #13
    ColoradoTJ

    ColoradoTJ So there I was.... Staff Member

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    Most differential lube has LS additive in it and it won't hurt anything except your wallet since the Tundra has not had a LS option since 2007.

    You can find out pretty quick if an aftermarket LS was installed. TC off, dirt road, from standstill mat the fuel pedal.
     
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  14. Jul 22, 2021 at 7:04 PM
    #14
    swallace

    swallace [OP] Insert profound statement —> here <—

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    6112/5160, DD 10”, Amp steps, Alea leather, more…
    Thank you all. Very helpful!
     

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