Diesel Engine Break-In PeriodThe ultimate goal of a "break-in" period is to allow machined surfaces in the engine combustion chamber to conform to each other's shape. Break-in helps to create a tight seal essential to preventing the escape of unburned fuel and pressurized gases from entering the crankcase. It also prevents engine lube oil from getting into the combustion chamber.......Want to learn more? Visit www.AuroraGenerators.com