Just like the title says. I have searched but can't seem to find anything specific.

 

I purchased Royal Purple synthetic 75w/90 for my girlfriends lsd in her t2. No idea if it's the best, but it's what I used. Car sits now like a typical rotary with wiring issues. Drove about 2000 miles, with two different rear ends. I had the same oil put in both. One was still making noise so I purchased a lower milage one. No sound back there.

RX7 1986-1992: Oil - Lubrication: Royal Purple - Max-Gear Lube 75W90 -

 

Redline and GM LSD additive.

 

i used royal purple and the GM LSD additive as well, with a shimmed diff, works awesome...

 

I used Redline 75W140 NS with Redline lsd additive.