BREAK-iN SERVICE
Generator Break-In Service
Generator Break-In service should be completed at 25 hours of run time. Why is this important?
Although a new or freshly honed cylinder appears smooth to the naked eye, it contains microscopic peaks and valleys. If the valleys are too deep, they collect excess oil, which burns during combustion and leads to oil consumption. The sharp peaks, meanwhile, provide insufficient area to allow the rings to seat tightly. That means highly pressurized combustion gases can blow past the rings and into the crankcase, contaminating the oil and taking potential horsepower with it. Generac states that a break-in period for an air cooled generator be after 25 hours of run time. It can be a little after 25 hours but shouldn't be more than 30 hours. Some companies will have you believe that it should be done at 3 months.
Information obtained from Amsoil.com