RedLine gear oil? But Hypoids??!? OHNO!

[dudealex1]

Anyway, I am looking at changing my MT and rear diff oil. The Redline MT-90 is perfect for my transmission in my NA 300zx in Minnesota, but I'm not sure about the differential. The 75-w90 looks good, but I'm not sure if I need the NS version or not. It says it's better, but not for Hypoid Differentials. I'm not sure if I have a hypoid differential , or a spiral differential. Help Please

[evildky]

I believe you have the viscous diff, standard fluid is fine

[Zwicked]

I changed to Royal Purple. Hard to tell if it makes it last longer or not, but what the heck, synthetics are always better.