The most common lubrication method for automobile engines is a comprehensive application of three methods: pressure lubrication, splash lubrication, and periodic lubrication, among which pressure lubrication is the core method. Pressure lubrication delivers lubricating oil at high pressure to high-load, high-speed moving components such as crankshaft bearings and camshaft bearings via an oil pump, forming a stable oil film to reduce friction loss. This systematic lubrication method ensures the reliability of key components under extreme operating conditions. Splash lubrication relies on oil droplets splashed by the rotating crankshaft to lubricate medium and low-speed components like cylinder walls and piston pins, with the advantage of a simple structure and no need for additional power. Periodic lubrication targets auxiliary components such as generator bearings, maintaining their operation by regularly adding grease. Modern engines usually adopt a composite lubrication system; for example, the main crankshaft bearings use pressure lubrication while the small ends of connecting rods use splash lubrication. The effectiveness of the lubrication system also depends on oil quality and regular maintenance. Car owners are advised to follow the maintenance cycle recommended by the manufacturer and use oil that meets API standards to ensure continuous and stable lubrication protection for all engine components.
