Generac 6003 Maintenance Kit, 7kW, 432cc & 420cc Core Power. The Air Cooled Scheduled Maintenance kits provide all the hardware necessary to perform complete routine maintenance on a Generac automatic standby generator. Oil will need to be purchased separately based upon manufacturer recommendations. Maintenance is recommended at every 100 hours or annually. Maintenance intervals may vary by model. Refer to manual for specific model maintenance requirements. Kit contents may vary by model.