The lube oil system's primary role includes delivering oil to moving parts to reduce friction and to assist in keeping the parts cool. Which statement best reflects this?

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Lubrication forms a protective film between moving surfaces, so metal-to-metal contact is minimized and wear is reduced. As oil circulates, it also carries heat away from bearings and gears to an oil cooler or heat exchanger, helping keep those parts within safe temperatures. This combination—reducing friction and providing cooling—captures the main role of the lube oil system. The other statements describe functions that belong to different systems: heating the engine, storing fuel, or filtering air.