How many categories are there according to SAE classification?

[DeViolet]

SAE grades represent the viscosity grades of lubricants. According to the SAE oil viscosity classification, automotive oils are specifically categorized into 4 types for summer use, 6 types for winter use, and 16 types for all-season use. Relevant details are as follows: Summer oil grades are: 20, 30, 40, 50, representing the kinematic viscosity of the oil at 100 degrees. The higher the number (the higher the viscosity), the better the protective performance of the oil at high temperatures. It should be noted that these numbers do not represent corresponding temperature values but indicate different kinematic viscosities of the oil at 100 degrees. Winter oil grades are: 0W, 5W, 10W, 15W, 20W, 25W. The symbol W stands for Winter, and the smaller the number before W, the lower the low-temperature viscosity, the better the low-temperature fluidity, and the lower the applicable minimum temperature. The corresponding oil freezing points are: 0W is -35 degrees, 5W is -30 degrees, 10W is -25 degrees, 15W is -20 degrees.

[StIker]

I've noticed many car owners are curious about how many SAE grades there are, which typically refers to engine oil viscosity ratings, especially the winter grades. The SAE officially classifies oil viscosity based on temperature characteristics, with 6 winter grades: 0W, 5W, 10W, 15W, 20W, and 25W, covering conditions from extreme cold to mild weather. 0W is the thinnest, ideal for cold starts, while 25W is slightly thicker. There are also summer grades like 30, 40, 50, etc., and combinations like 5W-30 multi-grade oils are quite common. Understanding these classifications helps you choose the right product during oil changes, preventing engine wear, especially for reliable protection during cold winter starts. In short, the SAE system is designed with these six or seven core grades to simplify maintenance, and I always check the manual to ensure compliance with the manufacturer's requirements when driving.

[VonEva]

When discussing engine oil, the SAE grade classification is a fundamental knowledge point, primarily based on viscosity performance. The SAE standard includes multiple viscosity grades, specifically, there are 6 fixed winter grades: 0W, 5W, 10W, 15W, 20W, 25W, each corresponding to different low-temperature fluidity tests. Additionally, there are high-temperature classifications such as 30, 40, etc., covering a wide range of usage scenarios to help match engine requirements. I often mention to friends when talking about cars that these 6 basic types solve cold-start issues, for example, 0W is particularly practical in Northeast China. Don't just look at the numbers when choosing oil; also consider the vehicle's age and road conditions. Maintaining the appropriate viscosity long-term can extend engine life.

[Nadine]

The SAE classification categorizes engine oil viscosity, with six winter grades: 0W, 5W, 10W, 15W, 20W, and 25W. Each grade undergoes rigorous testing to ensure smooth engine starts in cold temperatures. These standards simplify daily oil selection—0W suits freezing zones, while 25W performs adequately in slightly warmer conditions. Simply put, knowing these six types helps avoid unnecessary fault checks.

[VonChristopher]

From a safe driving perspective, the importance of SAE grades cannot be overlooked, as they define engine oil viscosity classifications. The winter portion consists of 6 specific grades: 0W to 25W, each designed for specific climates. For example, using 20W is acceptable in southern regions, but northern vehicle owners should opt for 0W to prevent cold start difficulties. With over a decade of driving experience, I consistently check oil labels during regular maintenance. Choosing the correct SAE grade helps reduce engine issues. This systematic 6-grade protection makes routine maintenance more worry-free and enhances driving reliability.

[McMaverick]

Looking back at the history of SAE, the classification system has long been refined, primarily categorizing oil viscosity types. There are 6 winter grades: 0W, 5W, 10W, 15W, 20W, and 25W, each corresponding to specific low-temperature performance tests. From classic cars to new energy vehicles, these fundamental standards remain unchanged, but their application has become more precise. I recommend car owners follow the manual's suggestions, such as newer engines often using 0W-20. This classification includes 6 winter grades, combined with other variations, comprehensively covering environmental requirements and making engine maintenance more efficient.