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What is the difference between Castrol 5w30 and 5w40?

1 Answers

RachelLee

07/29/25 7:32pm

The differences between Castrol 5w30 and 5w40 are: 1. Stability at high temperatures differs: 5w30 has poor stability at high temperatures; 5w40 has strong stability at high temperatures. 2. Oil viscosity varies: 5w30 has lower oil viscosity, making it suitable for new cars and new engines; 5w40 has higher oil viscosity, making it suitable for older cars and older engines. Engine oil consists of two parts: base oil and additives, with the base oil being the main component of the lubricant. The functions of engine oil include: 1. Cooling and temperature reduction; 2. Sealing and leak prevention; 3. Cleaning and purifying; 4. Shock absorption and cushioning; 5. Lubrication to reduce wear; 6. Rust and corrosion prevention; 7. Component protection, among others.

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