Generac 5665 Air Cooled Home Standby Generator Maintenance Kit, 20kW, 999cc Kit (For HSB models prior to 2013) Generac Guardian Maintenance Kit for 20kW Home Standby Generators Tune-Up Kit, Keep your generator running at optimum performance Contents: Air Filter, Oil Filter, Oil Funnel, Spark Plug, Chamois, Instruction Manual, Reminder Sticker (2008 to 2012) Includes: air filter, oil filter, spark plugs,oil funnel, chamois Oil must be purchased separately