Multigrade oils are designed to provide adequate lubrication at both high and low temperatures. This is achieved by blending different types of base oils together with specific additives. The base oils used in multigrade oils are typically mineral oils or synthetic oils. Mineral oils are derived from crude oil, while synthetic oils are made from chemicals that are not found in nature.
The additives used in multigrade oils are designed to improve the performance of the oil in specific applications. For example, some additives help to reduce wear and tear on engine parts, while others help to keep the oil from thickening at high temperatures.
Multigrade oils are typically labeled with two numbers, such as 10W-40. The first number indicates the oil's viscosity at low temperatures, while the second number indicates its viscosity at high temperatures. The lower the first number, the thinner the oil is at low temperatures. The higher the second number, the thicker the oil is at high temperatures.
