Amsoil MTF with carbon lined synchros

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Jaykim81

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Hey all,

I have a 2005 CRV AWD with a 6 speed manual transmission. (Tsx 6th gear was added) Currently I am running the Honda mtf II fluid and it is time to change it out. I have 3 quarts of amsoil MTF waiting to go in. I know amsoil says the MTF is compatible with the Honda fluid, but is it safe to use with carbon lined synchros? It seems that Honda decided to use the carbon lined snychros in this gearbox. I read a thread on this site that stated carbon lined synchros prefer a thinner fluid (which I know honda mtf II is). What are your thoughts? I do have a slight grind with the 1-2 shift.

I apologize if this thread ends up being another redline is better or amsoil is better
wink.gif
 
The crv has 73k miles on it. The grind is more of a bump when shifting. It feels as if the dog teeth skip one or two times before the collar locks on to the gear. It only really happens if I rush the 1-2 shift when cold. Otherwise it shifts fairly well. Al the other gears shift very smoothly. I just want to make sure the amsoil mtf doesn't cause the carbon lining to wear out faster. Especially because in Honda literature it always states "use Honda mtf only".
 
the Synchromesh MTF is what Amsoil recommends and they would stand behind that. If Amsoil does not have a fluid for the Application they do not recommend anything. You can try it since you already have the MTF and see if you notice a difference. thats my thought on that. just slow down on your shifting and be sure to use the clutch haha
 
I've been using it in a 2004 S2000 for about a year and a half. It has carbon fiber coated synchro's 6MT. I like it, but picking a MTF that you like for a MT is a very subject thing. I have tried several and have settled on this one for all around performance. But it's not perfect. I hope to post a used oil analysis soon to verify safe use.
 
You will be fine with the MTF, no harm to the carbon fiber and it will be at least as good for wear to the carbon fiber surfaces and better for the metal contact areas.
 
When the gearbox was apart I noticed the 5th gear snychros carbon face was pretty worn down. I was surprised at the wear since it is an "easy" shift considering the speed difference between 4th and 5th gear. Since I bought the car used I don't know how the previous owner drove it. I just figured since the synchro was worn with the factory fluid (which I believe it was factory fill since the fill bolt and drain bolts were not disturbed in any way along with the service record notshowing any transmission fluid service) I could probably do better with the amsoil.

Thank you everyone for your help.
 
Originally Posted By: INDYMAC
I've been using it in a 2004 S2000 for about a year and a half. It has carbon fiber coated synchro's 6MT. I like it, but picking a MTF that you like for a MT is a very subject thing. I have tried several and have settled on this one for all around performance. But it's not perfect. I hope to post a used oil analysis soon to verify safe use.


Can't wait for that used oil analysis!!!

banana2.gif
 
Originally Posted By: ltslimjim
Originally Posted By: INDYMAC
I've been using it in a 2004 S2000 for about a year and a half. It has carbon fiber coated synchro's 6MT. I like it, but picking a MTF that you like for a MT is a very subject thing. I have tried several and have settled on this one for all around performance. But it's not perfect. I hope to post a used oil analysis soon to verify safe use.


Can't wait for that used oil analysis!!!

banana2.gif


+2
It will be nice to see used oil analysis of Amsoil MTF in a S2000. I may change mine to Amsoil MTF if its used oil analysis looks good.
 
I posted some used oil analysis in the used oil analysis section.

For those who are experiencing shift problems, yes your transmission fluid could be worn out. But don't forget about freshening up your clutch fluid every two years. Clutch problems will wreak more havoc on the synchro's than the transmission fluid.
 
Do you mean DOT 3 or 4 for the clutch? Honda is fine. I've also used Valvoline DOT3/4 and like it too. I used to bleed the clutch, but have started to just evacuate the reservoir and refill multiple times with fresh fluid. If your fluid is old and grungy, I recommend bleeding it with freah fluid and then getting on an evacuate and refill program. Once I open a fresh bottle of brake fluid, I either use it all within a couple of weeks or toss it. Don't buy the large bottles of brake fluid. You will end up tossing most of it because you didn't need it all.
 
^Ah, good tip on the container size. Thanks. I've had to replace the master and slave on my Civic. I used EXEDY parts. The new slave bleeder I rounded during the initial air removal process, it was so easy to round it compared to the OE valve! gah!

Anyway, now I have to find out if the thread pitch for the bleeder on the aftermarket accept the valve from the OE or if I have to replace the slave again.

So, yeah you bet a poorly functioning hydraulic system will cause the synchros to grab more.
 
Quote:
When the gearbox was apart I noticed the 5th gear snychros carbon face was pretty worn down.


Did you replace the synchros while you had it on the bench?

About the only way one could check for carbon composite synchro wear is to do a visible light microscopic carbon particle count.
 
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