Trans oil

Discussion in 'Transmission' started by Melroy, Feb 14, 2009.

  1. Melroy

    Melroy Account Removed

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    I had a full head of hair before I started searching this forum for info on trans oils. Data overload ! I would like to switch to Spectro in my 5 sp, but I read the GL-1 rating is inferior to what is needed in a bike trans. Will the 6sp GL-5 rated oil work in my 5 speed? Also, which weight? 75/90 or 75/140 ? Maybe I should just go with Mobile 1. I want to get away from HD F+ in the trans.

    :bigsmiley22:
     
  2. glider

    glider Veteran Member

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    I used the Mobil 1 in the trans until I switched to Spectro and could see a difference using the Spectro for the better.

    The GL1 is all that is needed in the 5 speed and the GL5 is for the six speed with the helical gears but the GL5 can be used in either 5 or 6 speeds without a problem.
     
  3. 2002SilverSurfer

    2002SilverSurfer Active Member

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    I just went through this very same predicament last weekend and checked with the guys on here beforehand. Here was my final decision and diagnosis. I have a 2002 Heritage 5 speed. After talking with the guys at the dealer and of course the wizards on here (Thanks Glider and Smitty) the 6 speed GL-5 will work just fine and I believe Smitty even said it was bit of overkill but thats ok with me driving around the Washington DC area. It was the 75/140 and I couldnt be happier....rode about 300 miles after the change and I am very satisfied and happy....a bit on the pricey side but my scoot is my daily driver so its all worth it.
     
  4. JDiddy

    JDiddy Member

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    The Heavy Duty Spectro Platinum Full Synthetic Trans Oil GL 1 75/140 perfect for the 5 speed.

    Use the HD Platinum 6-speed if you have a 6 speed.
     
  5. T-Skully

    T-Skully Member

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    After reading on here I switched to Spectro in my '96 Road King w/ 5 speed trans and had to use the Spectro 6 speed GL-5 75/140 oil because that's all I could find in a local shop. I have been very pleased so far. No problems as of yet.
     
  6. glider

    glider Veteran Member

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    No problems at all using the six speed oil in a five speed. It's just extra additive packages for the helical gears in the six speed otherwise it's about as good as it gets.