Hi,
The TM 125 uses 550 ml of gear oil. There is level inspection screw situated behind the rear brake lever. Access is a little tricky, but not too tough.
For racing motocross I recomend ATF, but must be changed after each race day.
For enduro, outriding or Sunday riders, BelRay -Trans Oil 80 W is best. You should change oil roughly every 500 km to prolong gearbox life.
Regards
Jon
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