Has anyone ran this oil in their trans? My friend had 3 bottles of this stuff so he let me have them but not sure if it's ok to run this oil.

 

Yeah, that's been in my tranny for the past year and it works fine.

 

I don't see why it would not be ok. Manual tranny right? If so then go for it.

 

O.k just wanted to make sure I was good to go.

 

I'd be very careful about using any type of "gear oil" in your transmission.
Most gears oils have sulfates in them so they can handle higher loads.
Sulfates also attack yellow metals like copper and brass.
Welp, guess what your synchros are made out of...

I wouldn't use anything that does not say "okay for use in synchromesh transmissions" explicitly on the bottle.
I bet the 75W90NS doesn't.
Redline does make MT90 which is specifically designed for use in your transmission and the proper weight - 75W90.


-Ted

 

Wow thanks for the info. I guess I will have to try MT90 instead.

 

Ok bro,what kind of oil you recomend for the tranmission and for the differential?

 

You may want to contact Red Line. I think it will be OK because Red Line gear oil is non-corrosive up to 300degF, and the Mazda service manual specifies that the transmission can use GL-5. However, given the small cost of gear oil, I wouldn't put it in my transmission without clarification from the manufacturer.

Red Line MT90 for the manual transmission, and 75w90 for LSD. I haven't compared 75w90 and 75w90NS in the non-LSD differential, so I don't know which one works better.

 

Ya I will make a call and see whats up.