What is 5w30 engine oil?

1 Answers
BriannaFitz
07/29/25 4:36pm
5w30 is the viscosity specification of engine oil grade. The number before 'w' represents cold start performance - the smaller the number, the better the low-temperature fluidity of the oil. 'w' indicates suitability for winter use. The number after 'w' represents the kinematic viscosity of the oil - higher values indicate greater viscosity. Engine oil, also known as motor lubricant, consists of base oil and additives. Base oil is the main component of lubricating oil, determining its fundamental properties, while additives compensate for and improve deficiencies in base oil performance. Its functions include: 1. Reducing friction and high temperatures; 2. Cooling and temperature reduction; 3. Cleaning and purification; 4. Shock absorption and buffering; 5. Rust and corrosion prevention.
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