A scheduled maintenance program ensures the generator system is always in top operating condition and warranty requirements are being met. Generac's scheduled maintenance kits provide all the hardware necessary to perform complete routine maintenance on a Generac automatic standby generator. Oil must be purchased separately based upon manufacturer recommendations. Maintenance is recommended at every 200 hours or 2 years. The Generac 4.6-Liter 80 kW Liquid-Cooled Generator Scheduled Maintenance Kit comes with an oil filter, an air filter, pre-cleaner, 8 spark plugs, a spark plug wrench, an oil funnel, a chamois and a reminder sticker.