Scheduled maintenance is a necessity for all RV generators. The Generac Scheduled Maintenance kits offer all the hardware necessary to perform a complete maintenance on Generac RV generators. Oil will need to be purchased separately based upon the recommendations listed. Maintenance is recommended at every 100 hours or each year. If running in a dusty environment, more frequent maintenance may be required. Further maintenance details can be found in the generator owner�s manual. Scheduled maintenance kit includes all filters, spark plug(s), spark plug wrench, associated hardware and instructions.