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2008 Tacoma 4x4 6speed manual trans. Should I use conventional or synthetic gear oil?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by KevMo62, Mar 16, 2024.

  1. Mar 16, 2024 at 10:39 AM
    #1
    KevMo62

    KevMo62 [OP] New Member

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    I live where it gets cold in the winter. Unsure if I should use conventional or synthetic transmission oil 75W90 and what brand is best. Thank you!upload_2024-3-16_13-36-0.png
     

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  2. Mar 16, 2024 at 10:52 AM
    #2
    TacoTuesday1

    TacoTuesday1 Well-Known Member

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    both works.

    I’ve used both. And different weights. Just pulled out old diff that had BG syn 75w140 looked fine. Next diff put in ECGS recommended SAE 85w140 Lucas that I believe is non synthetic.

    Whoops, trans
    I had Redline MT90 but switched to what Amsoil recommends
    Don’t know if I’ll keep using it

    the MT90 felt kinda thick cold
    The Amsoil generally feels fine until it gets hot where it feels thin
     
  3. Mar 16, 2024 at 10:52 AM
    #3
    Masshole_And_His_Taco

    Masshole_And_His_Taco RIP Rick

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    Little bit of stuff.
    I've been running Redline MT90 in my trans for about 80k mi, currently at 302k. still shifts like butter once she's warmed up. Highly recommend.
     
  4. Mar 16, 2024 at 11:45 AM
    #4
    vssman

    vssman Rocket Engineer

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  5. Mar 17, 2024 at 2:45 AM
    #5
    lynlan1819

    lynlan1819 Well-Known Member

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    Lifted
    Synthetic
     
  6. Mar 17, 2024 at 6:34 PM
    #6
    Captain4x4

    Captain4x4 Well-Known Member

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    I've used Redline and the Ford XT-M5. Two rounds of each.
    No real difference, that I noticed, other than the Ford offering shifting much better 20 F and lower when cold.
    Amsoil is up next.
     
    vssman[QUOTED] likes this.
  7. Mar 17, 2024 at 6:38 PM
    #7
    vssman

    vssman Rocket Engineer

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    Good data point. Report back when you run Amsoil for a bit, please.
     
    Captain4x4[QUOTED] likes this.

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