Definition of engine oil viscosities

Engine oil viscosity refers to the fluidity of the oil at different temperatures. It is indicated by a combination of numbers called the viscosity grade. An oil's viscosity is important because it determines how well the oil circulates in the engine and how well it provides lubrication.

The first number in the viscosity grade indicates the viscosity of the oil at cold temperatures. This number is called the "winter" or "cold" viscosity and is typically a 0, 5 or 10. The lower the number, the easier the oil flows in cold temperatures. This is important because in cold temperatures the oil must be thin enough to flow quickly through the engine and lubricate all parts.

The second number in the viscosity grade indicates the viscosity of the oil at high temperatures. This number is called the "summer" or "hot" viscosity and can range from 20 to 60. The higher the number, the thicker the oil is at high temperatures. This is important because at high temperatures the oil must be thick enough to protect the engine from wear and damage.

There is also the abbreviation "W" in the viscosity class, which stands for "winter" and indicates that the oil is thinner in cold temperatures. For example, an oil with a viscosity grade of 5W-30 will have a thinner consistency in cold temperatures than an oil with a viscosity grade of 10W-30.

It is important to choose the right engine oil for your vehicle that is suitable for the specific needs of the engine. The vehicle manual usually provides recommendations for the correct viscosity of the engine oil. Incorrect engine oil viscosity can affect engine performance and even cause damage.

Overall, engine oil viscosity is an important factor in engine performance and longevity. Careful selection of the correct engine oil suitable for the engine's requirements is therefore crucial for optimal performance and protection.