Using Royal Purple Max Gear Oil as a top off 75W-90 synthetic for diff & manual trans. I notice my diff fluid was low. I didn't get to check the trans yet. Says its good for GL-4 and GL-5 fluids.


You think i'll be ok using this just for a top off?

 

I use it in my diff. No problem at all. Works great.

 

I would be concerned why the differential oil is low.

 

Yeah I had it on the lift one day and took the fill hole plug out stuck my finger in and nothing.