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Transmission fluid; GL-4, GL-5

Discussion in '1st Gen. Tacomas (1995-2004)' started by NegroTundra, Jan 7, 2011.

  1. Jan 7, 2011 at 4:13 PM
    #1
    NegroTundra

    #1
    NegroTundra [OP] Well-Known Member

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    I apologize in advance if I've missed it somewhere but I have searched through many threads, most of them missing the question I'm looking for.

    I changed my MANUAL transmission fluid yesterday with Castrol Syntec 75W-90, which conforms to GL-5 and MT-1 standards. Our owners manuals say to use a an API certified GL-4 or GL-5. I read this then went to the parts store and bought the Castrol brand thinking best bang for buck. After more searching today, I'm reading that transmission fluids in general, should be GL-4's, given a specific ingredient in the GL-5 formulas can actually attack certain (brass?) elements within the tranny. I'm now thinkin I should drain the ~$22 worth of oil I just put in my tranny and refill with Amsoil Transmission and Transaxle GL-4 fluid.
    Also, does this hold true for the transfer case too? The manual again for this says GL-4 or 5.

    Also, a good read here on different tests they put gear lubes through. Obviously it's produced by Amsoil so there may be some bias, but seems legit and thorough to me. http://www.amsoil.com/lit/g2457.pdf

    Thanks for any help guys:eek:
     
    NegroTundra, Jan 7, 2011
    #1
  2. Jan 8, 2011 at 5:49 PM
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    NegroTundra

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    NegroTundra [OP] Well-Known Member

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    Well, the shifting with Castrol GL-5 was VERY notchy and I was grinding gears pretty bad on normal driving shifts. Just dumped that and put in Redline MT-90 GL-4, what a a difference...smooth as butter, even in the cool temp today of 20 degrees. Redline FTW for Manual Transmissions.
     
    NegroTundra, Jan 8, 2011
    #2
  3. Jan 9, 2011 at 1:13 PM
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    troopa4life

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    troopa4life Member

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    Doug Thorley Shorty Headers
    Remove the oil immediately bro... I used Mobile 1
    $30 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
    75w-90 gear oil GL-5 and I had the SAME thing happen. I did my research on yotatech and purchased a gallon of Redline 75w-90 MT GL-4 oil and IMMEDIATELY after I replaced the oil... the grinding stopped and it was smooth as butter shifting. No worries about the transfercase you can keep the castrol you have in there now... hope this helps.
     
    troopa4life, Jan 9, 2011
    #3
  4. Jan 9, 2011 at 1:15 PM
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    troopa4life

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    troopa4life Member

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    HAHA I didn't see your second post... I see you took my advice in advance ;) glad you got it worked out.
     
    troopa4life, Jan 9, 2011
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  5. Jan 9, 2011 at 1:59 PM
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    '02TRD

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    '02TRD Well-Known Member

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    you already made the switch. i also run redline mt-90 in mine, good shit
     
    '02TRD, Jan 9, 2011
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  6. Jan 9, 2011 at 2:04 PM
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    steve o 77

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    steve o 77 braaap

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    x2
     
    steve o 77, Jan 9, 2011
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Products Discussed in

Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
$29.67
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