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Rear Diff, Valvoline 75-140 Syn gear oil VS 75-90 ?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Jaymtb, Feb 3, 2019.

  1. Feb 3, 2019 at 11:10 AM
    #1
    Jaymtb

    #1
    Jaymtb [OP] Well-Known Member

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    I was thinking of changing the rear Diff oil and using 75-140 Valvoline Synthetic LS gear oil instead of 75-90 in an older 140K 01 Taco with TRD locking rear. Thinking it might be less sensitive to rear seal leaks than 75-90 syn?
    Anyone with experience doing this ? Your Thoughts ? .
    Thanks,
    Jay
     
    Jaymtb, Feb 3, 2019
    #1
  2. Feb 3, 2019 at 11:14 AM
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    Unchained 5150

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    Unchained 5150 Rick

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    Unchained 5150, Feb 3, 2019
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  3. Feb 3, 2019 at 11:14 AM
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    eon_blue

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    eon_blue Most Improved Member

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    some guys that do alot of 4x4ing switch to the thicker 75w140...only downside to it that I've heard of is that it gets really thick and molasses like in freezing temps.

    I run the Valvoline full synthetic 75w90 in my truck front, rear and tcase...change each one every 25k miles. No issues
     
    eon_blue, Feb 3, 2019
    #3
    Unchained 5150 likes this.
  4. Feb 3, 2019 at 11:19 AM
    #4
    Clearwater Bill

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    Clearwater Bill Never answer an anonymous letter

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    Lubricant choice should not be expected to repair seal leaks.

    Running the viscosity and GL rating Toyota specifies is just fine.

    Running syn is a good idea if a) you work the gearset really hard or b) you're a mall crawler and you're willing to double your OCI, but it should still be the same viscosity and GL rating

    Otherwise, running a dino and using the recommended OCIs (based on duty type) is just fine.
     
    Clearwater Bill, Feb 3, 2019
    #4
  5. Feb 3, 2019 at 11:25 AM
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    Wyoming09

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    Wyoming09 Well-Known Member

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    I used75/140 gear oil for just about everything takes a long time to use a 55 gallon drum
     
    Wyoming09, Feb 3, 2019
    #5

Products Discussed in

Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
$29.10
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