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Why is GL4 OIL so hard to find?

Discussion in 'Technical Chat' started by ZEROPILOT, Jul 1, 2020.

  1. Jul 1, 2020 at 11:08 AM
    #1
    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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    I've scoured through Amazon, Ebay and all of my local parts stores and there is almost a complete absence of GL4 rated transmission oil.
    Why?
    GL5 oil/lube has additives that damage brass or bronze synchro rings. It accelerates wear by over 60% in some cases. And doesn't have a good drag coefficiency. It's too slick.
    A lot of oil out there says "GL4-GL5 Compatible" but then goes on to say that it is NOT to be used in synchronized transmissions!
    Most standard transmissions are synchronized.
    Does anyone sell a straight cut geared, non synchronized transmission?
    So why is it more or less not available?
    I found VALVOLINE Synchromesh oil. It actually claims to be GL1-GL2-GL3 and formulated for synchronized transmissions.
    BUT it's a super light 30w oil and probably not up to the workings of a truck transmission.
    So, with help from this forum, I've ordered REDLINE MT90.
    It IS GL4 and it IS rated for synchronized transmissions.
    But the reviews here and elsewhere are mixed.

    Why is GL4 not widely available?
    Have I missed something?
     
  2. Jul 1, 2020 at 11:48 AM
    #2
    EdgemanVA

    EdgemanVA Well-Known Member

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    Call your local shops to see if they carry Redline GL-4 oil. I buy it at my local BMW repair shop.
     
    RelentlessFab and ZEROPILOT [OP] like this.
  3. Jul 1, 2020 at 3:19 PM
    #3
    Brewnmn

    Brewnmn Well-Known Member

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  4. Jul 1, 2020 at 5:26 PM
    #4
    Nessmuk

    Nessmuk Well-Known Member

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  5. Jul 2, 2020 at 11:37 AM
    #5
    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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    Today I rebuilt my shifter with new plastic parts.
    There is some difference in smoothness.
    Next week, I'm dumping out the GL5 rated MOBIL 1 and replacing it with the REDLINE MT90
     
    doublethebass likes this.
  6. Jul 2, 2020 at 7:26 PM
    #6
    Rambo MARINE Recon

    Rambo MARINE Recon Well-Known Member

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  7. Jul 3, 2020 at 3:25 AM
    #7
    Wyoming09

    Wyoming09 Well-Known Member

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    One or two reasons First not selling enough to warrant keeping in stock.Why take up space for a product that just sits on the shelf

    Spot Shortage of The GL4 depending where you are in the country

    More and More Automatic Transmissions everyday .

    Some parts of the country Transmission Shops no longer take Manual Transmission work
     
    ZEROPILOT [OP] likes this.
  8. Jul 3, 2020 at 1:00 PM
    #8
    ROAD DOG

    ROAD DOG Well-Known Member

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    only a matter o time the white coat engineers change/revise something

    or the simply dont have anything to do

    as a result new entrants / many choices

    Red Line has many a varied selection

    good luck
     
  9. Jul 6, 2020 at 10:55 AM
    #9
    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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    LARGER WHEELS. DIFFERENT STEREO. PUSH BAR. TAILGATE EXTENDER. WIPER MOD. TPMS LIGHT DELETE MOD.
    Amsoil severe gear 75w90 is GL5
    AMSOIL doesn't recommend using it in a synchronized gearbox.
     
  10. Jul 6, 2020 at 11:01 AM
    #10
    slander

    slander Well-Known Member

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  11. Jul 6, 2020 at 12:23 PM
    #11
    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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    Funny because my brother put that in his generation one Tacoma AFTER it used to grind going into 2nd for at least 3 years...And it stopped grinding!
    It's a super light 30w and I have no idea if it worked out long term or not because he crashed it a little more than two months later.
    I hadn't considered it because I remember how thin it was.
    I believe its actually GL2 or 3 rated.
     
    Last edited: Jul 6, 2020
  12. Jul 6, 2020 at 12:27 PM
    #12
    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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    LARGER WHEELS. DIFFERENT STEREO. PUSH BAR. TAILGATE EXTENDER. WIPER MOD. TPMS LIGHT DELETE MOD.
    Ok
    The MT90 is in.
    The shifts are notable now. As in it kind of "clicks" into each gear.
    It used to just vaguely go into each gear without any feel.
    The synchros seem happy.
    The engagement is very different. Maybe it's a good thing.
    Between rebuilding the shifter and installing the MT90, it shifts much more positively.
    No slop whatsoever.
    I think I like it.
     
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  13. Jul 6, 2020 at 12:53 PM
    #13
    slander

    slander Well-Known Member

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    The synchro mesh?
     
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  14. Jul 6, 2020 at 2:43 PM
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    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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    Yes
     
  15. Jul 6, 2020 at 5:30 PM
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    Regcab05

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  16. Jul 6, 2020 at 5:31 PM
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    Regcab05

    Regcab05 Well-Known Member

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  17. Jul 6, 2020 at 10:14 PM
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    po35042

    po35042 Well-Known Member

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    +1 on the Redline MT90, smoothed mine out a good bit.
     
  18. Jul 7, 2020 at 6:30 PM
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    ZEROPILOT

    ZEROPILOT [OP] Can't re-MEMBER

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  19. Jul 10, 2020 at 10:31 AM
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    jh90731

    jh90731 Member

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    I am a newbie to this Tacoma World forum site. I joined to get just this type of info. My stepson has a 2014 Tacoma 4X4 with a 5sp and 4cyl w/ approx 55k miles. We're getting ready to change all the drive line fluids. Was planning to go with the Valvoline syncromesh manual transmission fluid (MTF) in the trans to meet the GL4 requirements and their Synpower full synthetic 75W-90 gear oil in the transmission and transfer case to meet the GL5 reqs. These oils are readily available at our local parts store which is one of the reasons why we're going with them. I know and respect that everyone has their personal oil preferences but does anyone see any issue running these in his 2014? Thanks in advance and glad I found this TW forum.
     
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  20. Jul 10, 2020 at 10:35 AM
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    Bishop84

    Bishop84 Well-Known Member

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    I've always used GL5 bulk standard 75w90 on my manuals. You won't have any issues at all, I've seen every oil use from cheap to special ordered Toyota MT fluid.

    You will be good with those choices. Word of the wise, buy some gaskets for the drain plugs from the Toyota dealer to ensure nothing leaks after. Good luck!
     
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