Correct answer
The oil pump.
The oil pump. It circulates lubricant to the points requiring it; location and circuit design depend on the engine. Not every pump is inside the sump and not every system uses the same layout. The cooler transfers heat, and the piston has a different function.
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The oil pump.
The cooler, whose sole function is to pump oil.
The piston, which alone replaces the pump.
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