What is SAE Number? SAE Viscosity Number.

What is SAE number is discussed in this article. I will cover all the SAE viscosity numbers in this article. 

What is SAE Number

What is the SAE Number

What is the SAE Number? The most common question in the lubrication system. The SAE number is essential for selecting the right lubricant for specific applications, ensuring optimal performance and protection for machinery and engines.
SAE full form is Society of Automotive Engineers. The Society of Automotive Engineers devised a grading system known as the SAE number to classify lubricants based on their viscosity. The SAE number provides a standardized way of identifying and categorizing lubricants and users to select the most suitable oil for their specific needs.
The Society of Automotive Engineers has recommended SAE viscosity number or lubricating oils. The viscosity number of any crankcase lubricating oil is determined by the range of viscosities within which it falls in the given temperature.

Decoding the SAE Number

The SAE number basically indicates two types in a very unique format. This is typically presented in the format “XW-XX,” where “XW” represents the winter viscosity and “XX” denotes the operating viscosity.
The winter viscosity indicates and tells the operating condition of the lubricant at lower temperatures, while the operating viscosity represents its behavior at normal operating temperatures.
A lower “XW” number indicates a lower winter viscosity, meaning the oil will perform better in colder climates. Similarly, a higher “XW” number signifies a thicker oil, more suitable for higher temperatures.
As for the “XX” operating viscosity number, a higher value indicates a higher viscosity, which is ideal for high-temperature applications, while a lower value represents a lower viscosity, suitable for low-temperature conditions.

SAE VIscosity Number

SAE viscosity number is very important for better engine running and operating at every temperature. 5W, 10W, and 20W SAE number lubricating oils are for winter use and the viscosity tests are made at 0 degrees Fahrenheit. 
20,30, and 40 SAE number lubricating oils are for summer use and the viscosity tests are made at 210 degrees Fahrenheit. 
The viscosity grade limits for motor oil, as recommended by the SAE handbook, are given in the following table-
SAE number Viscosity at 0 degrees Fahrenheit The viscosity of 210 degrees Fahrenheit
5W 4000 max. —————–
10W 12000 max. ——————
20W 4800 max ——————-
20 ——————– 45 to 58
30 ——————– 58 to 70
40 ——————— 70 to 85
50 ——————– 85 to 11



The SAE number is a critical factor to consider when choosing the right lubricant for your machinery and engines. I hope you like this article. 
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