In the wet sump oil system used by most cars, four to six quarts of oil are stored in a deep pan below the engine. The oil is sucked through a tube and pumped throughout the engine. With a dry sump system, the oil is stored outside the engine in a tank, instead of an oil pan. A dry sump has at least two pumps: one to send oil from the sump to the tank and one to send oil from the tank to the engine.
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