Generac® 6485 Home Standby Generator Maintenance Kit for 20-22 KW 999 CC EngineMaintenance is recommended at every 200 hours or 2 years. For 20 22 KW 999 CC Generac ohvi engine. If running in a dusty environment, more frequent maintenance may be required. Maintenance intervals may differ per model, refer to the generator owner's manual for more information. Kit includes, air filter, oil filter, spark plugs, oil funnel, chamois & a reminder sticker. Recommended oil: synthetic 5W 30 for temperatures between 20 & 1100 degrees