What are the five main functions of an engine lubrication system?

The five core functions of an engine lubrication system include lubrication, cleaning, cooling, rust prevention, and sealing. The lubrication function forms an oil film on the surfaces of moving parts to reduce friction resistance and wear, ensuring efficient engine operation. The cleaning function carries away metal debris, dust, and combustion residues through circulating engine oil, preventing secondary wear. The cooling function involves the engine oil absorbing and dissipating heat generated by working components, avoiding damage from localized overheating. The rust prevention function relies on the oil film to isolate air and moisture, protecting metal surfaces from corrosion. The sealing function is primarily evident between the piston rings and cylinder walls, where the oil film fills microscopic gaps to reduce gas leakage and enhance combustion efficiency. The design of the lubrication system directly impacts the engine's lifespan. It is recommended to regularly replace engine oil and filters that comply with SAE standards, while also considering oil level and viscosity selection. In tropical climates, grades with superior high-temperature stability, such as 10W-40 or 15W-50 fully synthetic engine oils, are recommended. The maintenance interval typically ranges from 5,000 to 10,000 kilometers or 6 months, with specific requirements to be referenced from the vehicle manual.