Originally Posted by JHM2K

Royal Purple is great but lasts ~20K before you start getting synchro slip

RedLine MTL... hands-down. It was what I was going to put in mine before the other driver upgraded my ride lol...

Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MTL 75W80 GL-4 Gear Oil

We used RedLine exclusively here at Nissan Motorsports, and it survives rdiculous amounts of abuse on the track.

You can order it at any O'Reily Auto Parts store... Two quarts should be more than plenty, I think factory fill is ~1.3 Qt (thereabouts). Shouldn't be more than $40 with tax