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Tranny Oil Report

Discussion in '1st Gen. Tacomas (1995-2004)' started by nedjinski, Dec 21, 2009.

  1. Dec 21, 2009 at 12:18 PM
    #1
    nedjinski

    nedjinski [OP] Member

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    I have a 2003 Reg Cab 4x4 2.7 4 Cyl.

    At 35,000 I decided to change out the tranny and read diff fluids. On the recommendation of several threads here I chose Mobil 1 75-90 Synthetic as a replacement fluid for both.

    It is now 5 months since the change.

    I live in eastern Colorado where the winters can be pretty cold at times.

    Before I made the fluid change the tranny performed normally as I would expect it to - no hard shifts, no grinding, no noise, etc. Didn't matter how cold it was.

    Since the change and especially in cold weather the tranny shifts hard and I can feel the gears when shifting. It gets better as the tranny warms up. When stone cold the first shift from 1st to 2nd is next to impossible - I have to double clutch and finesse it to get it to shift smoothly. Even when fully warmed up I can still feel the gears when shifting into 5th for example.

    I am worried that I am prematurely wearing out my synchros.

    So to say to least I am very disappointed with Mobil 1 gear oil and will be changing back to OEM or equivalent (not sure what brand would be equivalent ???)

    Any thoughts on this situation? Am I the only one who has had this experience? Why would the OEM oil be so much smoother than the supposedly superior synthetic ?
     
  2. Dec 21, 2009 at 12:24 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Check to see if the Mobil 1 is a GL-5 gear oil. GL-5 has an additive in it that eats copper based alloys (bronze = synchros). What ever oil you go to, make sure it has a GL-4 rating. I have always used Amsoil or Rotella for my gear oil.

    The Mobil 1 is supposed to be copper friendly though.
     
  3. Dec 21, 2009 at 12:38 PM
    #3
    nedjinski

    nedjinski [OP] Member

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    one of the confusing things is that many oil say GL-4 or GL-5.

    it is hard to find straight GL-4 that is specifically NOT GL-5.
     
  4. Dec 21, 2009 at 12:45 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I think the Rotella is GL-4 specific. I will check the one bottle I have left at home to see. The GL-5 effect is supposed to a long term thing too. I am not trying to say that is the issue here. I know a few members on this board that have used the Mobil 1 in first gen trannys without incident also. They are from warmer climates though. Maybe the Mobil 1 doesn't fare well in the extreme cold weather?
     
  5. Dec 27, 2009 at 10:07 PM
    #5
    BG04Taco

    BG04Taco Well-Known Member

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    I put royal purple in mine and its doing the same. When its cold its hard to shift until it warms up. I dont know if it is because the oil is new or what. I think once it is driven a while might be ok. I would like to try amsoil but its not available in stores. Can you only get amsoil through a rep?
     
  6. Dec 27, 2009 at 10:11 PM
    #6
    pittim

    pittim mittip

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    Pink slider.
    Try Redline MT90 in the trans and tcase. I know a lot of people run it (at least on TTORA) and for the most part are all happy with it.
     
  7. Dec 31, 2009 at 10:24 AM
    #7
    BSP4x4

    BSP4x4 Guest

    This just happened to me...changed the stock gear oil out on my 09 Manual 6 speed and used redline MT90 75-90 and i have to say the stock oil was much smoother....anyone else notice this?
     
  8. Jan 1, 2010 at 9:57 AM
    #8
    fpradojr36

    fpradojr36 Active Member

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    Are you saying that you used gear oil for tranny also? Cause if you did it's a huge mistake. But maybe I read it wrong.
     
  9. Jan 1, 2010 at 10:10 AM
    #9
    itsmyturn

    itsmyturn Well-Known Member

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    i think he means manual trans
     
  10. Jan 24, 2010 at 10:34 PM
    #10
    trucklover63

    trucklover63 Active Member

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    i used to work at a mitsubishi dealership,which mitsu had real notchy manual transmissions...the factory told us to use general motors syncromesh manual transmission oil...you wouldn't believe how big of a difference it made..i would use that or buy factory from toyota if u were happy before this
     
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