Originally Posted By: Zaedock
Any SN conventional would be fine for your use. No need for syn except to sleep better.
I'd be more worried about the poorly Nissan radiator destroying my transmission.
I did the transmission line by-pass, taking it out of the radiator loop, many years ago for this reason. The aux. cooler on the transmission lines these vehicles have seems to be more than adequate to keep things cool. Also did a complete radiator flush, as well as a transmission flush replacing the Nissan Matic J with Mobil synthetic ATF. Mine stills shifts as smooth as the day I bought it. Still not sure what the problem was with ATF/anti-freeze mixing. Some claim it was the Matic J eating some weak welds in the radiator.