Well, that was simple. I should have done that in the first place. Dealer said, 3qt in tranny ~2.5qt in LSD use synthetic in both. After talking to the nissan dealer and reading most of redline's tech information, I think I'm going to go with 3qt 75W90 synthetic gear oil for LSD and 3qt MT-90 (non synthetic 75W90) for tranny. So for 6qts its $42-10%(thanks WeST! )+$6.76S&H=$44.56. Kinda expensive, really hope this helps 3rd gear. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>