The lube oil system of a diesel engine delivers oil to the moving parts to reduce friction and to assist in keeping the parts cool.

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Lubrication does more than just form a film to keep parts from rubbing together. The oil film between moving surfaces reduces friction, which lowers wear, and it also picks up heat from these hot components. In a diesel engine, oil is pumped from the sump to bearings, gears, piston pins, and other interfaces. As it flows over these hot areas, it absorbs heat and is carried to an oil cooler where the heat is removed before the oil returns to the sump to repeat the cycle. Keeping the oil at the right temperature and maintaining adequate flow preserves its viscosity and film strength, ensuring effective lubrication and cooling. So the statement is true because the lube oil system is designed to lubricate and remove heat from moving parts, helping to keep them cool.