The Generac 5719 maintenance kit is designed for the 410cc engine portable generators. Scheduled maintenance is a necessity to ensure the long life and top performance of your portable generator. If your generator has been running for extended periods or has been stored for several months, it's a good idea to change the oil and fill the tank with fresh gasoline. Be sure to review your owner's manual for the suggested maintenance schedule. The maintenance kit includes: air filter, oil filter, oil funnel, spark plug, fuel stabilizer, and chamois. Oil must be purchased separately.