What Does the Engine Oil Model Number Mean?

[CharlesLee]

Engine oil model number represents: Typically indicates viscosity and quality. The viscosity of lubricating oil is often identified using SAE grades. The 'W' stands for Winter, and the smaller the number before it, the better the oil's low-temperature fluidity, indicating a lower environmental temperature it can be used in and better protection for the engine during cold starts. The number after 'W' is an indicator of the oil's high-temperature resistance; the larger the number, the better the oil's protective performance at high temperatures. Automotive engine oil is essentially a lubricant that serves to lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption, earning it the nickname 'the blood of the car.'