I run Justice Brothers Extreme Gear Oil treatment mixed in with the 75/90. Here is what their product claims:
Gear Oil Treatment
Smooth shifting of manual transmissions while quieting gear & bearing noises helping them last longer. Prevents corrosion & reduces operating temperature. Approved & tested for pos-traction & limited slip rear-ends. Contains JB Metal Conditioner.
Smooths shifting of manual transmissions
Quiets gear and bearing noises
Prevents corrosion
Reduces gear temperatures
Improves bearing and gear life
Ran it on the last sl, as well. Can't find any data as to how much it reduces temps, but is thicker than snot, and has to do a better job coating the metal.
