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Rear Diff Gear Oil Suggestions

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Hunter_Bick12, Jul 10, 2020.

  1. Jul 10, 2020 at 2:02 PM
    #1
    Hunter_Bick12

    Hunter_Bick12 [OP] Well-Known Member

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    Hey guys, I did use the search function and I found a little bit of information.. But I am peculiar and want more. So I called the dealer and wanted OEM gear oil. Although it is expensive, my issue wasn’t really the price at first. They said it does not come in squirt bottles and I would have to have a pump of some sort. Well, having done that with the trans fluid before, I know it sucks. Basically, that along with the price has led me to ask what brand you guys are using for your 75-85 GL5 drain and refills. Also, if anyone knows of OEM that comes in a squirt bottle, I’d be all for a link. As always, thanks and keep Tacoma’in!
     
  2. Jul 10, 2020 at 3:19 PM
    #2
    TnShooter

    TnShooter Well-Known Member

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    Never seen OEM in Squeeze bottle. (And I don’t believe it’s anything special)
    I used Valvoline 80w-90 in E-Locker Diff.
    Is it technically the correct fluid? No.
    Have I had issues with it in 50k miles? Not yet.

    Others have used it as well. I know this because I asked this same question myself.
    My Diff was leaking, I was low on fluid, and I couldn’t find 75w-90 close to my house.

    If you can find 75w-90 (wal-mart has synthetic) use it.
    I wouldn’t run synthetic in the mechanical LSD Diffs. (Which I don’t believe you have)
    Been a few reports of synthetic causing issues in the mechanical LSD Diffs.
     
  3. Jul 10, 2020 at 3:20 PM
    #3
    nd4spdbh

    nd4spdbh Well-Known Member

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  4. Jul 10, 2020 at 3:22 PM
    #4
    TnShooter

    TnShooter Well-Known Member

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    Yeah, only reason I even mentioned it was for the potential future readers.
    Seeing as it was just last week, there was a member having issues with synthetic.
     
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  5. Jul 10, 2020 at 3:46 PM
    #5
    Hunter_Bick12

    Hunter_Bick12 [OP] Well-Known Member

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    Thanks for the reply. OEM probably isn’t anything special, I’m just an oem type person. Truck seems to like it so I’d like to give it, but I don’t think it would be too big of an issue just going with same weight and different brand. Which leadS me to this question.. Any specific reasons you/others recommend 80-90 over the oem 75-85 weight? I also can’t confirm whether I have “E-Lockers” or not. I have lockers, I’ve just always kept it simple and called it rear lockers. No 4wd, just rear diff lockers. I would assume this is E-Lockers, but don’t know for sure. Mechanical vocabulary is a minimum until I learn more, lol
     
  6. Jul 10, 2020 at 3:49 PM
    #6
    BillsSR5

    BillsSR5 Looking out for #1

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    REDLINE 75-85 gl5
     
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  7. Jul 10, 2020 at 3:50 PM
    #7
    Hunter_Bick12

    Hunter_Bick12 [OP] Well-Known Member

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  8. Jul 10, 2020 at 3:51 PM
    #8
    Hunter_Bick12

    Hunter_Bick12 [OP] Well-Known Member

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    Ah, same weight. I like it. I will give this a look. Have you or anyone used Castrol/Mobil-1,Valvoline, etc? Some of the more popular brands?

    If so, thoughts? Thanks for your reply!
     
  9. Jul 10, 2020 at 3:51 PM
    #9
    TnShooter

    TnShooter Well-Known Member

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    E-Locker just means it is actuated Electronically. (Like the factory one you have now)
    It uses an Electric Motor to Engage the Locker.

    I’m not recommending 80w-90. I’m just stating that myself and others have used it.
    If you can’t find 75w-90, the next best choice is 80/90.
     
  10. Jul 10, 2020 at 3:53 PM
    #10
    Hunter_Bick12

    Hunter_Bick12 [OP] Well-Known Member

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    Ah, I see what you’re saying. So, any reason for 75-90 over 75-85?

    Not saying your wrong or trying to be picky, just doing research.. Thanks!
     
  11. Jul 10, 2020 at 3:54 PM
    #11
    BillsSR5

    BillsSR5 Looking out for #1

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    its pricey but good. if not I recommend just using SUPERTECH 75w90 gl5 full synthetic best bang for the buck
     
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  12. Jul 10, 2020 at 3:56 PM
    #12
    BillsSR5

    BillsSR5 Looking out for #1

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    75w90 is thicker at certain temps but not much, the VALVOLINE synthetic 75w90 is about as close as you can get to a 75w85 oil in viscosity
     
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  13. Jul 10, 2020 at 3:57 PM
    #13
    TnShooter

    TnShooter Well-Known Member

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    If you want to get technical, the 75/85 will flow slightly better at hot temperatures.
    The lower the number the “thinner” the oil is, at a given temperature.
    Thinner is not the correct term, but it’s easier to understand.
     
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  14. Jul 10, 2020 at 4:00 PM
    #14
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    I typically use 75W90 or 80W90 because the manual for my 2008 calls for 90 weight or 80W90. So it would seem having a viscosity of 90 is the consistent part of the specification and I dunno the significance of 75 vs 80.

    Screen Shot 2020-07-10 at 4.59.13 PM.jpg

    FWIW, the most recent change I went with the Chevron Delo Syn-Gear 75W90. It's full synthetic and was cheaper than Mobil1. Over the years I've used Castrol Hypoy-C and Redline 75W90.

    Honestly, the only lubricant that I always use is MT90 in the transmission otherwise it's kind of whatever meets the spec and I can find.

    DELO Syn Gear 7590.png
     
    Last edited: Jul 10, 2020

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