Hey - I recently purchased a 2006 G35 coupe. I decided to change the transmission oil at the local mechanic. He used aftermarket transmission fluid and not the OEM Matic-S. Is this a big concern? It is to my understanding that you can't easily drain all of the new fluid. Not sure if I just leave it alone, drain/fill or completely flush. What do you all recommend? I made this change under a week ago and have not really been driving the car much.

 

You’ll be ok 😃.

 

Many G35 owners have had their transmissions rebuilt at a shop…including myself. U think the transmission shop actually puts in S-matic fluid? Hell no!!!

My transmission has been running fine, and that was probably about 20K miles ago.