A scheduled maintenance program will ensure that your generator is always in top operating condition and that your warranty requirements are met. Generac offers a comprehensive line of scheduled maintenance kits to ensure long life and top performance of your standby generator system. Generac's 5662 maintenance kit provides all the hardware necessary to perform complete routine maintenance to ensure your generator is always in top operating condition. Oil must be purchased separately based upon manufacturer's recommendations. Maintenance is recommended at every 200 hours or 2-years.