How often do you need to change manual transmission fluid? I had mine changed to GM Synchromesh Friction Modified (solved the infamous 3rd gear issue) a little over two years ago and 24,000 miles. Is it time to get it changed? Shifting is fine but I do get a little notchiness every now and then - nothing serious but it's not quite at smooth as it was even a couple months ago.

 

I think 30k+ miles. Has it been cold up there, sometimes that causes it to get notchier.

 

every 30k

to save some tranny syncro, at a stop light shift into third then first..somewhat helps notchiness.

thats what i do

 

Read this:
https://acurazine.com/forums/3g-tl-2004-2008-93/gm-synchromesh-modified-mtf-620194/

Seems 25Kmi to 30Kmi is good.

 

Thanks everyone for the advice. I'll probably go ahead and change it some time this summer, IF I can find a GM dealer that's still in business!

 

I do mine every 40,000 miles. But then, I have never experienced any of the problems that others have had with their manual TL's.