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kommon_sense said:
last time I checked mobil1 did not make a gl-4 based transmission fluid. What does that mean? It means it is not yellow metal friendly. The synchros in honda/acura trannies are brass (a yellow metal) and a non gl-4 based tranny fluid (like what mobil1 offers) will eat the synchros. Do not use a mobil1 tranny fluid in a honda/acura.

Why do the two metals differ?
 

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White Pride SI said:
I am in the process of putting back together my D16z6 tranny and I just bought some syncromesh fluid. I went to the dealer but I picked up the friction modified syncromesh. The cost was $30 for 2 qrts. I should be back on sunday to give the heads up.
Well everything turned out great. It makes a huge difference with this Si tranny. I cant remember what gear it used to grind in but it is gone now.
 

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Another happy customer! it has been just over a week since i put the GM synchromesh (i didnt get the kind with "friction modifier"). very very pleased! though at over 10$ a quart i wasnt too happy, it was about the cheapest tranny "fix" possible. my tranny would grind at about 3800 rpm going into third gear. i havent completly stress tested my tranny... nor do i really intend to, but i have shifted with no grinds into third gear up to 6k rpm. thats more than high enough for me to pull into indy traffic. FYI i have in my car a b16/GSR tranny. i wasnt able to find the other brands of the synchromesh at a parts store.... they all looked at me like i was stupid. just another HELL YEAH for this stuff. best regards...
 

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well just poured in some Penz syncromesh.

just pulling out of the driveway was great! car shifts much smoother after just driving down the street.

gooood stuff. best I have used.

I have tried Honda MTF, reline and now this is handsdown the best.
 

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I am considering changing mine to GM syncromesh as well as I have heard mostly great things. Anyone know how often the GM stuff should be changed?
 
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