For winter grades, the oil is tested at temperatures as low as -35°C (-31°F), while high-temperature grades are tested at 100°C. The Science Behind the Grades The specific numbers assigned by the SAE are not arbitrary; they are based on precise kinematic viscosity measurements.
Understanding SAE Ratings for Engine Oil
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. This dual-number format defines the classification of multi-grade oils, which are designed to work efficiently year-round.
The resulting data determines whether the oil meets the strict criteria for a specific SAE viscosity class. Using an oil that is too thick can lead to poor fuel economy and difficulty starting the engine, while using one that is too thin can result in inadequate lubrication and accelerated wear.
Understanding SAE Ratings for Engine Oil
An oil with a high viscosity flows slowly and resembles syrup, while a low viscosity oil flows quickly and resembles water. Summer Grades The number preceding the "W" indicates the oil's viscosity during cold conditions.
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