what weight of tranmission oil do i use on my S14? and diff also!

[phyco99]

i am about to drop a new clutch in my s14, and i just want to know what weight of oil should i use in the transmission? and since i am going to have the car jacked up, i am going to drain the diff, so what weight is that? thanks guys, and let me know.

[rico05]

I have been running Royal Purple 85W full synthetic for about 5 months now. Love it. I ran it for about 6 months in my FC3S and it was great for the worn synchros. Good stuff.

[574-240sx]

I use regular 80/90.

[Dookie]

I use penzoil synchromesh oil for my transmission, good oil for cars with yellow metal synchros and stuff, works great on my s13, not sure if the s14 has yellow metals in it as well. For my diff (LSD ) im using valvoline synthetic 80w90