With the ATS LSD I have found the Redline 80W-140 (no extra additive added) to be the best to date, plus a solid pinon spacer to cope with 400+ rwhp and track days, it stands up to much more abuse than my previous setup of Redline 75W-90 and the crushed pinon spacer, had to rebuild it as it started whining after the crushed spacer collapsed allowing the pinon to float back and forth.

Cheers