GL3 vs GL4/5

[Jesse]

I went to change the fluid in my manual transmission, and everywhere I looked has specified GL3 fluid, but I'm wondering if it would be ok to put a GL4 or a GL5 fluid in instead?

 

[carnuck]

Sure, but only if you want to destroy your synchros! The only trans use brass vs bronze rings (or vice versa) and the sulphur "slippery" agent in the 4/5 fluid gets the munchies and eats them while you drive.

 

[Bounty__Hunter]

Stick with a GL3 or your synchros will go south. I recommend Redline MT90, a little pricey but well worth it to make the AX5 and AX15 transmissions last.

 

[jfrabat]

I'll also agree with the 2 posts here, and also recommend MT90.

 

[Jesse]

Stick with a GL3 or your synchros will go south. I recommend Redline MT90, a little pricey but well worth it to make the AX5 and AX15 transmissions last.

Where could I get it? Would it be in a place like kragens or pep boys? or even napa auto parts?

 

[jfrabat]

Where could I get it? Would it be in a place like kragens or pep boys? or even napa auto parts?

I ordered mine over the internet, as no local shop carried it when I lived in Miami (I have NO CLUE how I will deal with this here in Costa Rica now!!!). I have heard Syncromesh also works well, but I personally have no experience with it...

 

[Bounty__Hunter]

I order mine from Summit Racing.

 

[Jesse]

Red Line Synthetic Oil 50304 - Red Line MT-90 Transmission Gear Oil - Overview - SummitRacing.com

That is the right stuff, correct?

 

[Bounty__Hunter]

Yes, that's it.

 

[Jesse]

Thanks for all your help! You just saved a manual transmission!