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20.1.1 The purpose of this Article is to ensure that the engine oil used in Formula One is engine oil as
this term is generally understood. The function of an engine oil is to lubricate moving parts, to
improve the overall efficiency of the engine by reducing friction and to reduce wear. It also
cleans, inhibits corrosion, improves sealing, and cools the engine by carrying heat away from
moving parts. Engine oils should not enhance the properties of the fuel nor energize the
combustion. The presence of any component that cannot be rationally associated with the
defined functions of the engine oil will be deemed unacceptable.