Jimmy Mendoza, Army and Air Force Exchange Service Car Care Center auto technician, tightens a bolt into an engine July 19, 2013 on Andersen Air Force Base, Guam. AAFES technicians recommend that filters and oil be changed every 3,000 miles or every three months to ensure a vehicle continues running well. (U.S. Air Force photo by Airman 1st Class Amanda Morris/Released)