Conventional 80W-90 Break-In Gear Oil from Driven provides excellent break-in protection by utilizing a high EP (extreme pressure) additive package that promotes proper mating of gear sets without scuffing or pitting. By polishing the gear teeth, micro-pitting is eliminated to improve gear durability. A smooth gear surface can carry more load and will last longer. This oil is designed for hypoid and spiral bevel gear sets like those found in 9-inch and quick-change rear ends. It is safe to use in gear boxes and differentials and will not harm brass or copper components. Driven’s 80W-90 Break-In Gear Oil is designed to be drained following the normal break-in cycle (500-700 miles) on new gear sets to remove break-in wear metals. A synthetic gear oil may then be used to get the most protection and efficiency from the rear gear and transmission.