OTHER PRODUCTS Preventive Maintenance BGS offers a semi-annual Preventive Maintenance program. The program consists of two (2) inspections per year, which includes one minor inspection and one major inspection. Minor inspections include industry standard checks, inspections, clean up, and testing of all fluids and electro-mechanical system components and accessories. Major inspections include the minor inspection plus removal and replacement of the oil, filters and spark plugs (if necessary). Please contact us for a quote.