Which statement best describes a lubrication system's primary function?

• A. Move oil through the system to maintain engine temperature
• B. Provide an adequate supply of clean oil to bearings and gears at the right pressure and temperature to remove heat from the engine and remove contaminants from the system and deposit them in the filters
• C. Store the oil in a separate external tank
• D. Seal the oil system to prevent leaks

Answer: (C)

The lubrication system’s main job is to deliver clean oil to the moving parts that need it—bearings and gears—at the right pressure and temperature so lubrication reduces wear, the oil removes heat from those parts, and contaminants are carried to the filters where they’re trapped. The pump pushes oil through passages to bearings and gears, through an oil cooler to shed heat, and through filters to remove debris before the oil returns to the sump. Storage in a separate external tank is not the primary function; it’s part of the system’s hardware, not the core purpose. Sealing and preventing leaks are important for system integrity, but the essential function centers on providing proper lubrication, cooling, and filtration to protect components.