I had purchased Redline Oils for my tranny and rear differential some time ago but yesterday I finally got a chance to put it in.

For the tranny I used:


And for the rear differential I used:


This morning on my way to work I noticed the shifting was much smoother and quieter than before. It was definitely worth doing, thanks to everyone who has posted previously about their experiences.

P.S.
The OEM gear oil smells like ***!

 

Red line here too!

 

Watch out. That synthetic crap will cause carbon deposits in your transmission and Mazda will have to recall them as they'll start to slip

 

^^
lol the amusing part about that is I wouldn't be surprised if they pulled that crap on me.

 

I guess I'd better switchback to the good stuff, dino oil!!!