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What are the main components of engine oil?

1 Answers

VanAlivia

07/30/25 5:42am

Engine oil is composed of base oil and additives. For mineral oil, the base oil is refined from petroleum; for fully synthetic oil, the base oil is artificially synthesized. The following are the functions of automotive engine oil: 1. Lubrication and friction reduction: It forms an oil film on the surfaces of two sliding components to prevent friction during operation and ensure smooth movement. 2. Cleaning and dispersion: High-quality engine oil can flush away dirt from component surfaces through oil flow, adsorb tiny metal fragments in the engine, and then scrape them into the oil pan via the piston oil ring. 3. Cooling: The engine generates high temperatures during operation. When the oil reaches the operating parts, it absorbs heat and carries it away, aiding in component cooling. 4. Sealing and leakage prevention: It forms a seal between the piston rings and pistons through an oil film, preventing combustion exhaust gases from entering the crankcase. 5. Rust and corrosion prevention: High-quality engine oil adheres to component surfaces, protecting them from contact with air, acidic substances, and harmful gases, thus safeguarding the engine from corrosion by atmosphere and water.

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