Regal 5w30 or 5w40?
1 Answers
For the Buick Regal, 5w40 engine oil is better because it has a higher viscosity. The differences between 5w30 and 5w40 engine oils are: 1. Different high-temperature stability. The number after 'W' indicates the kinematic viscosity of the engine oil at 100°C. A higher number means higher viscosity, which translates to better protection and stability at high temperatures, meaning it is less likely to thin out under heat. Therefore, 5w40 is more stable at high temperatures than 5w30, making 5w40 the better choice for the Buick Regal. 2. Different usage scenarios. 5w40 has better viscosity than 5w30, making it more suitable for older vehicles. Engine oil is a specialized lubricant for internal combustion engines and also serves functions like cleaning, rust prevention, and cooling. Engine oil consists of base oil and additives, where the base oil is the main component of the lubricant, determining its basic properties, while additives improve the shortcomings of the base oil.