So ya, I'm wondering when I should change my manual tranny fluid?? I have an 01 Protege, has 157k miles, and have had it since around 135k. Not sure if the guy before me did it or not. It drives fine and the tranny is smooth. I've had other Mazda's before and have replaced the fluid at the dealer and after that, it just wouldnt shift the same, not very smooth, hard to get into 1st... it was very weird... why would they do that? You'd think it'd shift better after a change.
Thanks guys.

 

When in doubt - change it. i use GM Synchromesh - no problems. Even stock fluid is okay.