Generac 20 KW Generator Maintenance Kit. It includes an air filter for cleaner air intake, an oil filter for efficient oil filtration, spark plugs for optimal ignition, an oil funnel for mess-free oil changes, a chamois for easy cleaning, and a reminder sticker for timely maintenance. For best performance, use synthetic 5W-30 oil for temperatures between -20 and 1,100 °F, 10W-30 oil for temperatures between -10 and 40 °F, or SAE 30 oil for temperatures between 32 and 110 °F. Oil is not included.