Dave Roney, 28th Force Support Squadron Auto Hobby Center manager, illustrates how to check a vehicle's engine oil level at the Auto Hobby Center on Ellsworth Air Force Base, S.D., July 2, 2013. Engine oil is no longer classified by summer or winter weight, but must be kept at the proper level and replaced at the appropriate time to aid in the lubrication, cleaning and cooling of a vehicle's engine. (U.S. Air Force photo by Airman 1st Class Ashley J. Thum/Released)
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