Engine oil is a vital component in car maintenance. The main function of engine oil is to lubricate, clean, cool and seal the engine to ensure normal operation of the engine. There are many types of engine oil on the market, including multi-grade engine oil and single-grade engine oil, based on the different characteristics of the engine oil. So, what does multi-grade/single-grade engine oil mean?
In automotive terms, multi-grade and single-grade engine oils refer to different viscosity grades of oil.
Single-grade motor oil, also known as single-grade motor oil, has a fixed viscosity grade at a specific temperature. For example, SAE 30 is a common single-grade oil with a viscosity rating of 30 at 100 degrees Celsius. This means it has a high viscosity when cold and a lower viscosity when hot.
Multigrade engine oils, on the other hand, may have different viscosity grades at different temperatures. For example, SAE 5W-30 is a popular multigrade oil with a cold winter (W) viscosity rating of 5 and a hot viscosity rating of 30 at 100 degrees Celsius. “W” represents the oil’s ability to flow at low temperatures.
Multigrade oils are designed to provide better cold starting performance while still maintaining proper lubrication at high operating temperatures. The first number (e.g., 5W in 5W-30) indicates the oil’s cold flow ability, while the second number (e.g., 30 in 5W-30) indicates its viscosity at high temperatures.
Multi-grade engine oil and single-grade engine oil refer to a type classified according to the oil viscosity grade. Multi-grade engine oil, also known as multi-viscosity engine oil, is an engine oil that can have multiple viscosity characteristics within a certain temperature range. Single-grade engine oil refers to an engine oil that can only maintain a constant viscosity within a single temperature range. This kind of engine oil usually has a single viscosity characteristic, so it may be subject to certain limitations in adapting to temperature changes. Secondly, multi-grade engine oil can provide more comprehensive engine protection, effectively reduce engine wear and extend engine service life.
Multi-grade motor oils are suitable for all types of engines, including gasoline, diesel and hybrid engines.
In daily maintenance and use, car owners should choose the appropriate multi-grade or single-grade engine oil according to the specific needs of the vehicle.
In short, multi-grade engine oil and single-grade engine oil are types classified according to oil viscosity grades. They have significant differences in viscosity change, lubrication performance, fuel economy and engine protection. By understanding the meaning and advantages of multi-grade/single-grade engine oil, car owners can better choose the engine oil suitable for their vehicles in daily maintenance and use, and pay attention to regular replacement to ensure the normal operation of the engine and extend the service life of the vehicle.
Overall, multi-grade motor oils offer greater flexibility and adaptability to different temperatures and conditions than single-grade motor oils.