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LSD Additive in Manual Trans?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by jspadaro, Jul 28, 2011.

  1. Jul 28, 2011 at 2:34 PM
    #1
    jspadaro

    jspadaro [OP] Well-Known Member

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    The only synthetic 75W-90 gear oil I can find is mobil-1 with LSD additive.

    I know I don't need the LSD additive, but will it hurt anything if I throw it in the transmission?

    I know it doesn't hurt my non-LSD diffs to have it.
     
  2. Jul 28, 2011 at 2:36 PM
    #2
    jspadaro

    jspadaro [OP] Well-Known Member

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    Uh... manual transmissions take 75W-90 in these trucks. :confused:

    Edit: Somebody told me not to use gear oil. The post I was quoting was deleted before I finished posting this...
     
  3. Jul 28, 2011 at 2:38 PM
    #3
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    I wouldn't, it's a friction modifier. I don't know definitively if it would hurt anything but I wouldn't risk it.
     
  4. Jul 28, 2011 at 2:39 PM
    #4
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    That was me, I didn't catch the manual transmission part :eek:

    I was going to yell at you to not put gear oil in your transmission, sorry!
     
  5. Jul 28, 2011 at 2:39 PM
    #5
    jspadaro

    jspadaro [OP] Well-Known Member

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    Well, you also told me not to use gear oil in the first place. :p

    I'd just like to use synthetic, and this is the only 75W90 synthetic i've found around here, but you have a good point.

    Maybe chris4x4 will chime in.
     
  6. Jul 28, 2011 at 2:41 PM
    #6
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Yeah, I'm gonna go and try to get my foot out of my mouth :eek: Sorry I missed the manual transmission part, but I would be concerned about the friction modifier. Wait for Chris!
     
  7. Jul 28, 2011 at 2:42 PM
    #7
    jspadaro

    jspadaro [OP] Well-Known Member

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    Yep, agreed, this is why I ask these things before I pull a Krazie SJ. Thanks for the input!
     
  8. Jul 28, 2011 at 2:47 PM
    #8
    KenLyns

    KenLyns Lord of War

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    My local Subaru dealer surprisingly has shelves choke full of AMSOil fluids. Maybe they are trying to appeal to the STi crowd. Can't hurt to give your local Subaru dealer parts counter a ring.
     
  9. Jul 28, 2011 at 2:52 PM
    #9
    jspadaro

    jspadaro [OP] Well-Known Member

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    I may check if O'Reillys has valvoline, looks like they may.
     
  10. Jul 28, 2011 at 3:37 PM
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    jspadaro

    jspadaro [OP] Well-Known Member

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    hope chris4x4 sees this bump
     
  11. Jul 28, 2011 at 4:11 PM
    #11
    jspadaro

    jspadaro [OP] Well-Known Member

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    Also, the manual does say API GL-4 or API GL-5, and this mobil-1 with LSD additive says it exceeds GL-5 specifications...
     
  12. Jul 28, 2011 at 4:23 PM
    #12
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    The friction modifier might not be good for the synchros.

    Amsoil severe gear is great (past experience).
     
  13. Jul 28, 2011 at 4:52 PM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The gear oil that says, for example "75-90 LS" means its safe in an LS Diff.....It doesnt mean it has the friction modifier in it. Mobil 1 doesnt have the addative in it, but simply uses the "LS" to state it is safe to use in all diffs.
     
  14. Jul 28, 2011 at 4:56 PM
    #14
    jspadaro

    jspadaro [OP] Well-Known Member

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    so i can use it?
     
  15. Jul 28, 2011 at 5:00 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Yup!
     
  16. Jul 28, 2011 at 7:33 PM
    #16
    jspadaro

    jspadaro [OP] Well-Known Member

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    Well, I went ahead and did it, so I hope Chris is right! I'm assuming/hoping that with LSD additive or not, GL-5 spec oil is GL-5 spec oil.

    Quick test run didn't have it shitting itself at least!
     
  17. Jul 28, 2011 at 7:34 PM
    #17
    davestaco

    davestaco TW's number one gear whore

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    i put mobil one 75w90 in my tranny about 15k miles ago and have had no issues
     
  18. Jul 29, 2011 at 4:18 AM
    #18
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Yeah, I e-mailed them a while back about it, and they said there were NO friction modifiers in it...
     
  19. Jul 29, 2011 at 4:30 AM
    #19
    T@co_Pr3runn3r

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    Good to know since I just did the M1 75-90w in both manual tranny and the diff recently...and M1 5-20w w/oem filter for the 4 cyl.
     
  20. Jul 29, 2011 at 4:44 AM
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    Demoncleaner

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    Done two Transmission, transfer case, and front diff oil changes over the years with off the shelf M1 75w-90. Works great.
     
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