Hello, recently acquired a Fit rs and am sadly having trouble tracking down the proper manual or service info on it.
Car has been driven 120k km and the cvt has never been serviced..

My questions are:
Which fluid should I use?
Is is bad for the cvt if I do the trans service now?

Car is currently driving smoothly. The current cvt fluid looks brownish clear on the dipstick.
Chasis number GE8-1032959

Any help is greatly appreciated!
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I'd Use the HONDA fluid sometimes they just get things mostly right....

 

Which one would that be?

 

I'd go to the dealer and just give them the year and model they should know which blend for your trans.
its one of those yes its a little more money, but, every honda product I've owned just runs better with their oil in in.. (YMMV)

The honda Blend Bike oil even worked great in my Suzuki DR350, made the clutch work awesome..

 

Same as mine most likely, the current North American CVT fluid is compatible, and you should change it at that mileage, or sooner. I did mine at 65000km, and I think I'll keep doing it at roughly that interval. I used Line app to find a Honda Fit group in Japan, and they said it's roughly about 3.5 litres of fluid per change. There's no flushing on these, if you want the closest thing, change the fluid, drive it a bit, change it again and you're good to go.