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Most production cars have a wet sump oil system.
In a wet sump, the oil that you put into the engine is stored beneath the crankshaft in the oil pan . In a wet sump, the oil pump sucks oil from the bottom of the oil pan through a tube, and then pumps it to the rest of the engine. In a dry sump , extra oil is stored in a tank outside the engine rather than in the oil pan. The minimum amount of oil possible remains in the engine. The oil capacity of a dry sump can be as big as you want.