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Nonsynethic 80w-140 Gear Oil??

Discussion in 'Performance and Tuning' started by Ckatz53, Nov 24, 2020.

  1. Nov 24, 2020 at 2:14 PM
    #1
    Ckatz53

    Ckatz53 [OP] Newish

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    Had 5.29 Nitro gears installed with a PowerTrax Grip Pro LSD in the rear. Coming up on the 500mile gear oil swap and am having issues sourcing conventional 80w-140 gear oil (GL-5) and quite frankly don't know much about them to know where to look.

    Everything I find online is synthetic or has friction additives. PowerTrax specifically says conventional (nonsynthetic) with no friction modifiers. They also state only 80w-90 but a quick call to them said 80w-140 is fine and their website info is incorrect.

    I've got 4 quarts of 80w-140 synthetic for the front, just lacking what I need for the rear. Anyone able to point me in the right direction?
     
    Last edited: Nov 24, 2020
  2. Nov 25, 2020 at 10:11 AM
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    Fspmdt

    Fspmdt New Member

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    Bam 8 exhaust 285/70 18 ridges 4:88 gears, auburn lsd 6112s SPC UCA
    Lucas 85/140
     
  3. Nov 25, 2020 at 12:37 PM
    #3
    Ckatz53

    Ckatz53 [OP] Newish

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    Thats what I thought as well, but a call to Lucas says it does have friction modifiers in it.
     
  4. Nov 25, 2020 at 12:58 PM
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    Vizsla

    Vizsla ☠️☠️☠️

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  5. Nov 25, 2020 at 1:38 PM
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    Fspmdt

    Fspmdt New Member

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    pretty much all gear oil has some type of friction modifier in the additive package. Im thinking you don’t need an LSD additive. I have the lucas in mine with the auburn lsd. I had to add the LSD additive separately because the lucas did not come with it
     
  6. Nov 25, 2020 at 2:05 PM
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    Ckatz53

    Ckatz53 [OP] Newish

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    I tow frequently. Running 80w-90 would burn the gear up oil way quicker so I need the heavier weight. I just got 7 qts of Lucas 85w-140 and going to run it in both diffs.
     
  7. Nov 25, 2020 at 2:07 PM
    #7
    Ckatz53

    Ckatz53 [OP] Newish

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    Yeah thats what I'm finding. Very few, if any, petrol based basic gear oils left. Gonna run Lucas 85w-140 in both and call it a day. Need the higher temp stuff since I tow.
     
    Last edited: Nov 25, 2020
  8. Jan 11, 2022 at 3:38 PM
    #8
    MadMaxCanon

    MadMaxCanon New Member

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    Necro thread but I am getting 5.29s this week with a powertrax grip pro and I had trouble finding a non synthetic without friction modifier as well and am going with either the valvoline in the white bottle or richmond, which is the 2 that powertrax said they use. The richmond part number was RICHGL5 which is double the price of the white bottle valvoline which they said was fine too.
     
  9. Jan 11, 2022 at 4:02 PM
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    Ckatz53

    Ckatz53 [OP] Newish

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    For what it's worth, I've got 24k miles with the Lucas stuff and 0 issues everything working as intended.
     
  10. Jan 11, 2022 at 4:18 PM
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    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Makes sense, i think the white bottle lucas is pretty much rated the same as the valvoline, just didnt look at it close enough to see if it didnt have the friction modifier.
     
  11. Jan 11, 2022 at 4:38 PM
    #11
    Vizsla

    Vizsla ☠️☠️☠️

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    No problem with the Valvoline under very hard use for 2+ years. Reading the reviews on here my experience is different, barks tire turning, and aggressively locks up, really like it. Not sure if running the dino 80w-90 with no additives is responsible though.


    Lucas has friction modifiers
     
  12. Jan 11, 2022 at 4:55 PM
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    snivilous

    snivilous Member

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    Just to throw another brand in, my powertrax/5.29s have had synthetic Amsoil since I got it a year ago and 25k later it works great too :D my thought was better oil shouldn't hurt anything, worst case the LSD doesn't engage as well but nothing should get hurt.
     
  13. Jan 11, 2022 at 5:33 PM
    #13
    ColoradoTJ

    ColoradoTJ I drink…and I know things. Staff Member

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    What is your rear differential temperature?

    I run 85W/90 and have never been over 170*F. I’ve had trailer tires at about that temperature.

    The good thing about running a higher weight gear lube is for shock load. So there is a benefit to that for sure.
     
  14. Jan 11, 2022 at 6:31 PM
    #14
    rothmigo

    rothmigo New Member

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    Same here in rear diff the Lucas 85x140 dino, plus Auburn friction modifier, have Nitro 5.29 and Auburn LSD. If not for the Auburn would be running the Nitro 80x140 blend. I've got a ways to catch up to your miles so good to see it's been all good!
     
    Ckatz53 [OP] likes this.
  15. Jan 12, 2022 at 3:54 AM
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    timsp8

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    I know that Auburn says not to use synthetic gear oil, but I’ve been using the nitro 80w-140 for a couple of years with mine and its running fine. I also added a tiny bit of friction modifier last time I changed the oil. I can feel it lock up like when on ice but not around normal turns on dry pavement.
     

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