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Which rear diff gear oil should I use?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Tortugax626, Aug 19, 2020.

  1. Aug 19, 2020 at 11:26 AM
    #1
    Tortugax626

    Tortugax626 [OP] Well-Known Member

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    I have a 2013 base model Tacoma 2wd 5 speed mt reg cab and it’s time to change the rear diff. It’s a 2.7 2tr engine and was wondering which gear oil you recommend for the rear diff? All advices are welcomed ty
     
  2. Aug 19, 2020 at 11:31 AM
    #2
    nd4spdbh

    nd4spdbh Well-Known Member

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  3. Aug 19, 2020 at 12:28 PM
    #3
    Michigan Curmudgeon

    Michigan Curmudgeon Well-Known Member

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    Depends how you use the vehicle.

    Good synthetic gear oil can last a very long time with 'normal' use, not so long with towing, hauling, etc.

    I selected the Amsoil Severe Gear 75W-90 at 30K miles. My use is light duty so that will stay in there for 100K miles as Amsoil specs. If I liked changing gear oil even a little bit, I would have gone with a cheaper product.

    Mine is a '15 Base 2wd unit with 2tr-fe and 4 speed auto. The differential took a full 4 quarts. The Amsoil bags are handy, clean, and the new generation oils do not stink like the old stuff did.

    There is zero MPG penalty I've observed changing from the usury priced Toyota 75W-85 to the 75W-90.

    Get a GOOD 24mm 1/2" drive socket for it, and a set of crush washers. It took a long breaker bar to get the fill plug loose. The drain plug was easier by far to remove.
     
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  4. Aug 19, 2020 at 2:24 PM
    #4
    Tortugax626

    Tortugax626 [OP] Well-Known Member

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    I plan to have a constant payload of like 300lbs what viscosity should I use or just stick with 75w 90? My local dealer has the Toyota genuine gear oil 75w85 but they want $28 per qt
     
  5. Aug 19, 2020 at 3:14 PM
    #5
    Michigan Curmudgeon

    Michigan Curmudgeon Well-Known Member

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    I researched it a bit before selecting the SVG.

    75W-85 was developed as a fuel saving measure. The first company that made an additive package to make that possible was Lubrizol.

    There was no change to the differential when they started using this as factory fill. It was for CAFE requirements. Much as with 0W-20 engine oil.

    Going much thicker than 75W-90 might result in loss of some fuel economy and likely will actually make the differential run hotter.

    That would only be needed in cases of heavy loading, and then would require a frequent gear oil change since heat is what deteriorates the lube.

    I'd stick with the 75W-90.
     
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  6. Aug 19, 2020 at 3:15 PM
    #6
    ryfox0276

    ryfox0276 Well-Known Member

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    Supertech! Cheapest out there- oil is oil. Been very happy with it. Change out the rear every 15-20k and the front every 25-30k.
     
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  7. Aug 19, 2020 at 3:19 PM
    #7
    Gen2 Man

    Gen2 Man Well-Known Member

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    Sometimes the cheapest automotive parts turn out to be the most expensive.
     
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  8. Aug 19, 2020 at 3:24 PM
    #8
    Tortugax626

    Tortugax626 [OP] Well-Known Member

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    What are svg?
     
  9. Aug 19, 2020 at 3:24 PM
    #9
    NAAC3TACO

    NAAC3TACO Middle aged member

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    I changed my diff oil last year at 50k and it still looked good. Just a little darker than new. I used Valvoline 75w90 synthetic and plan on 50k changes from now on. If you tow or haul heavy loads often, I would change it at shorter intervals. JMO.
     
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  10. Aug 19, 2020 at 3:30 PM
    #10
    Michigan Curmudgeon

    Michigan Curmudgeon Well-Known Member

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    Any GL-5 rated gear oil would meet the requirements.

    The premium products offer longevity due to superior base oils and additive packages.

    Your choice.
     
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  11. Aug 19, 2020 at 3:30 PM
    #11
    whatstcp

    whatstcp currently drunk so don't listen to me

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  12. Aug 19, 2020 at 3:31 PM
    #12
    Michigan Curmudgeon

    Michigan Curmudgeon Well-Known Member

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    A common abbreviation for Amsoil Severe Gear, a trademark.
     
  13. Aug 19, 2020 at 3:35 PM
    #13
    Tortugax626

    Tortugax626 [OP] Well-Known Member

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    Ok thanks guys so I’m just going to get a gl 5 rated diff oil 75w90. Another question, I posted in another thread just earlier but was wondering what rear diff I have? I jacked up the rear and spun the driver side tires and the passenger rear was still. I spun the passenger rear tire and the driver rear tire was still. I was in neutral and parking brakes was disengage.
     
  14. Aug 19, 2020 at 3:40 PM
    #14
    whatstcp

    whatstcp currently drunk so don't listen to me

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    You have a 4.10 open diff
     
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  15. Aug 19, 2020 at 3:41 PM
    #15
    Michigan Curmudgeon

    Michigan Curmudgeon Well-Known Member

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    It's an open differential.

    You do not need an additive.

    The 'locking' part of this design if you can even call it that, is accomplished by the stability control system modulating the rear brakes to simulate (very poorly) a locking differential when the button is pushed on the dash.

    They are allowed, somehow, to list this as 'locking differential' on the equipment list.

    It's borderline fraud, IMO.
     
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  16. Aug 19, 2020 at 3:46 PM
    #16
    Tortugax626

    Tortugax626 [OP] Well-Known Member

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    Is it worth it to put a locker there in the future? Planning to turn it to an off-road rig when I save up more
     
  17. Aug 19, 2020 at 3:50 PM
    #17
    Michigan Curmudgeon

    Michigan Curmudgeon Well-Known Member

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    I'd likely want a 4 wheel drive vehicle for off road use.
     
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  18. Aug 19, 2020 at 3:58 PM
    #18
    Tortugax626

    Tortugax626 [OP] Well-Known Member

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    I agree
     
  19. Aug 20, 2020 at 7:40 AM
    #19
    Jarod888

    Jarod888 Well-Known Member

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    On Amazon, a 6 pack of royal purple 75w90 is $86 and change, so thats about 14 bucks a quart.
    Mobile 1 is 13 and change.
    Ive used both. I'm going with the Royal purple again.
    I change the diffs and transfer case every 30k, along with the plugs.
     
  20. Aug 20, 2020 at 8:24 AM
    #20
    ARB1977

    ARB1977 It’s a beaut Clark

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    I use Amsoil Severe Gear 75W90. For normal use and I don’t drive like a dick at 30K it’s still brand new looking. I may go 70K on this go around.
     
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