MTF Fluid
Joined: May 2002
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From: North Carolina
Originally Posted by 2007 Zx-10,Aug 13 2008, 10:41 PM
I'm running Amsoil synthetic 75w-90...shifts better than new
Joined: May 2002
Posts: 2,548
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From: North Carolina
Originally Posted by RugRunner,Aug 13 2008, 09:07 PM
No, actually, I'm not sure. I just figured that to smooth out the shifting, I'd switch out the tranny fluid. My car does make a slight clunk maybe 1 of every 3 times that I put it in first from a complete stop...no grind, just a clunk, and in my complete uninformed opinion, it sounds farther back, like in or near the diff. Are we saying that there are three different fluids to manage-clutch fluid, tranny fluid, diff fluid?
Joined: Feb 2004
Posts: 1,491
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From: Pensacola
I was going back and forth between Honda MTF (new) and Amsoil MTF. I then started mixing the two until I started getting the 1-2 grind again. I'm currently running straight Amsoil MTF and it seems to be running smoother than before.
If your car has no problems with Honda MTF - it's fine to stick with it. However, Amsoil MTF seems to last about twice as long before it gets notchy. My car has an '04 AP2 transmission.
If your car has no problems with Honda MTF - it's fine to stick with it. However, Amsoil MTF seems to last about twice as long before it gets notchy. My car has an '04 AP2 transmission.
Joined: Feb 2004
Posts: 1,491
Likes: 11
From: Pensacola
Originally Posted by RugRunner,Aug 12 2008, 08:37 PM
I've noticed some notchy shifting in my trans. Slight grind going 1st to 2nd when not fully warm, but I guess that's not at all uncommon for S2s. I have a 2005 AP2 with 22k on it. In searching, I found posts back from 2001 where people used, with great results, Castrol Syntrans 75W-85 manual transmission fluid in place of what came in their S2000 from the factory. Any current suggestions or input on what to use would be greatly appreciated. I've only had my S2000 for a month so bear with me here...Thanks!
Registered User
Joined: May 2007
Posts: 2,140
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From: Orlando, FL
My transmission was notchy too, and had a 1-2 grind at redline. Changed to honda mtf, tranny feels exactly the same but now theres no 1-2 grind at redline. I have NEVER had a 1-2 grind when the trannys cold, dont know why its so common with everyone else.
Registered User
Joined: Nov 2003
Posts: 1,729
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From: Magnolia, TX
AMSOIL makes a manual tranny fluid 75W-90 GL4 labeled MTG (not MTF synchromesh). I tried a 60/40% mix of the two (MTF/MTG) on my last tranny fluid change and ran it for 1000 miles. It never felt very good at all, so I can't recommend this mix to anyone. Honda MTF in it again now and shifts great! I'll probably just stay with Honda MTF from now on, and change it when it starts to get notchy again. No problem.