Is synchromesh safe to mix with synthetic tranny fluid?
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This is a discussion on Is synchromesh safe to mix with synthetic tranny fluid? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have grinding problems and i have heard good results with the use of synchromesh but its not gl 5 ...

  1. #1
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    Is synchromesh safe to mix with synthetic tranny fluid?

    I have grinding problems and i have heard good results with the use of synchromesh but its not gl 5 rated and i dont trust it to do all of the work. i want to mix one quart of synchromesh with 3 quarts of amsoil 75-90 but am unsure if it is safe to mix the two. is synchromesh synthetic or are there any synthetic alternatives?

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    Registered User Retro's Avatar
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    If you feel uncomfortable then just don't use it.
    clutch, shift, gas, clutch, shift, gas, shift, clutch, gas, clutch gas, shift... oops!

  4. #3
    Registered User 45Logic's Avatar
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    I think Synchromesh is a blend...

    I put Amsoil Series 2000 75w90 in my transmission and it shifts fine, though, without and mixing.

    I hear Redline Shockproof works really well, and Royal Purple makes a great GL-5 gear lube as well.

  5. #4
    Registered User 5spdfrk's Avatar
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    Uncle Scotty over on Nasioc uses
    1qt. Lightweight Shockproof
    1qt. GM syncromesh
    and the rest Castrol HypoyC 75w90 or Valvoline 75w90.

    He says it works real well for him, and many people have tried is mix and said they liked it as well.

    I believe that I will try this when it's time for me to drain and refill teh tranny.
    '02 WRB WRX
    '92 Civic Si

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    i was making sure synchromesh wasnt a dino oil that cant be mixed with synthetic. most modern oils can be mixed with synthetics but i have been told that some older formula's can't. it dosent sound like this is one of them
    i think im gonna track down 1qt of penzoil synchromesh and if i can find the redline shockproof, a qt of that as well. it sounds just like what im looking for.
    thank you.

  7. #6
    Registered User 5spdfrk's Avatar
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    Sure thing.
    '02 WRB WRX
    '92 Civic Si

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