DIY Civic Type R Transmission Fluid Change

ez12a

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Changed the transmission fluid to GM Synchromesh FM as it worked great in the past in my old 6MT TL.

Initial impressions: less to no "crunch" when shifting a cold transmission. Slightly dampened feeling when shifting through the gates (like it's thicker fluid).

I never had any issues with grinds in my transmission, only noisy and notchy shifting with the occasional hang-up into 4th gear. The 1 > 2 shift has never been very quick and almost always requires a slight pause in neutral and this has not changed with the fluid swap. It does feel less "crunchy" though.





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chattanoogaR

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Eh, putting GM fluid in a Japanese econobox would never be high on my priority list.

Glad to see you are noticing results though.
 

shadow

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The Honda crowd has been successfully using GM Synchromesh Friction Modified for decades.
 
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ez12a

ez12a

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Yep, worked great in the TL where third gear grind was not uncommon. Never experienced the grind.

People also put ford fluid into miata transmissions so it's nothing new lol
 
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ez12a

ez12a

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Cool, in any case, hope this video is helpful to anyone considering changing the fluid, whichever fluid they choose.

I found many of the video guides dont detail the airbox removal which is 90% of the job, and mostly just talk lol.
 

TheCanadian

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That ford fluid is known in the Miata as Ford's Unicorn Tears. Precisely because it works magic but is very pricey.
 

MarcusgibbS

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I changed mine with amsoil. No negative results. I haven’t tracked yet but have about 30k now. Another alternative to gm. I have in my em1 too, although that generally sits 😕
 

YattleMe

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I changed mine with amsoil. No negative results. I haven’t tracked yet but have about 30k now. Another alternative to gm. I have in my em1 too, although that generally sits 😕
I'm at 23k miles now and I've been thinking of changing out the oem fluid. Probably going to go with amsoil as well. I'm going to send in a sample of my oem mtf to black stone to see what they say about it.
 
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ez12a

ez12a

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Any other impressions with the new mtf?
YMMV but for me it has been working great, 100+ miles later. Shortly after my test, I also adjusted the freeplay on the pedal and master cylinder, which seemed to provide a marginal improvement over just fluid. With the combined changes, still no grinding (wasn't a problem before), no 4th gear partial engagement, no partial reverse gear engagement has occurred yet. I will update if I notice a deterioration in performance.

There is definitely less "gear" feel/friction/meshing (best i can describe it) when entering through the shift gate, and more just the detent spring lump feel.
 

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