Guardian 20-22 KW Home Standby Generator Maintenance Kit. This maintenance kit is designed for Generac 20-22 kW home standby generators manufactured in 2013 or later. It includes an air filter, oil filter, spark plugs, oil funnel, chamois, and a reminder sticker. Maintenance is recommended every 200 hours or 2 years, or more frequently if running in a dusty environment. Refer to the generator owner's manual for more information. Recommended oil: Synthetic 5W-30 for temperatures between -20 and 1100 °F, 10W-30 for temperatures between -10 and 40 °F, SAE 30 for temperatures between 32 and 110 °F. Oil not included.