The commonly used lubricants for automobiles are mainly divided into four categories: engine oil, transmission and gear oil, hydraulic oil, and grease. Engine oil is the most widely used type, primarily designed to reduce internal engine friction and dissipate heat. Common examples include fully synthetic oils such as Castrol Edge 5W-40, which offers excellent high-temperature performance and is suitable for high-performance vehicles. Transmission and gear oil is specifically engineered for drivetrain systems, capable of withstanding high pressure and shear forces. For instance, Bolun No. 68 anti-wear hydraulic oil is suitable for mechanical gearboxes. Examples like No. 32 or No. 46 anti-wear hydraulic oil are commonly employed in construction machinery. The former is suitable for routine chassis lubrication, while the latter withstands temperatures up to 160°C, making it ideal for high-temperature components like wheel hubs. These lubricants must be replaced periodically as specified in the vehicle manual to ensure optimal mechanical component longevity and performance. For example, passenger vehicles typically require engine oil changes every 5,000 to 10,000 kilometres, whereas commercial vehicles may need more frequent intervals due to heavier workloads. When selecting lubricants, pay attention to API classifications and viscosity ratings-for instance, SP-grade fully synthetic oils comply with the latest environmental standards.
