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There are several thousand different lubricating oil products manufactured in the United States. Lubricating oils fall into three categories: automotive lubricants, industrial lubricants, and greases. The three main types of automotive lubricating oils are crankcase oils, transmission and axle lubricants, and fluids for hydraulic torque converters and fluid couplings used in automatic transmissions. Automotive lubricating oils keep various parts of auto bodies and engines running smoothly by cushioning adjacent metal pieces, oiling moving parts, and keeping dirt out of combustion chambers. Industrial lubricating oils range from machine oils to steam-turbine oils. Lubricating oils can be purchased retail at a wide range of shops, stores and outlets.
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