Preload setting Before: Approx. 140 Nm (MZ setting) After: 50-60 Nm (RS setting with reduced 75%) I purchased x2 1L 80w-90 LSD Oil. Cusco says do NOT use any additives (friction modifier) with our LSD. If I still have to much chatter noises in the future, the backup plan is to change to the Spec-F inner plates (no grooves plain plate). This can help to reduce the noise a lot.