Which part of the engine reduces friction between moving components?

The oil pump plays a crucial role in reducing friction between moving components inside the engine. It circulates engine oil throughout the engine, lubricating various parts—such as the pistons, crankshaft, and camshaft. This lubrication creates a thin film of oil that separates moving metal parts, significantly minimizing direct contact. By reducing friction, the oil pump helps to prevent wear and tear, ensures smoother operation, and ultimately contributes to the overall efficiency and longevity of the engine.

In contrast, the catalytic converter is responsible for reducing harmful emissions and does not influence friction. The crankshaft is a key component that converts linear motion into rotational motion but does not play a direct role in reducing friction. The fuel pump's primary function is to deliver fuel to the engine, which is vital for combustion but unrelated to the mitigation of friction within the moving components.