Higher numbers such as 30, 40, or 50 indicate a thicker oil that maintains its structure and oil film strength when the engine is hot. Choosing the Right SAE Rating for Your Vehicle Selecting the correct SAE grade is not a matter of preference but a requirement for engine health.
Understanding SAE Oil Viscosity Ratings and What They Indicate
These oils utilize additives called viscosity index improvers to adjust their flow properties. Specifically, the "SAE" designation within that code refers to the Society of Automotive Engineers, the organization that established the uniform grading system used globally.
Viscosity, in simple terms, is a fluid's resistance to flow or its thickness. Summer Grades The number preceding the "W" indicates the oil's viscosity during cold conditions.
Decoding SAE Ratings: Understanding Oil Viscosity Numbers
This rigorous scientific process ensures that every bottle labeled with an SAE rating meets strict performance benchmarks, regardless of the manufacturer. Modern technology, however, introduced multi-grade formulations that combine the benefits of two grades.
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