The Science Behind the Grades The specific numbers assigned by the SAE are not arbitrary; they are based on precise kinematic viscosity measurements. As a result, a 10W-40 oil can flow like a 10-weight oil in the cold while providing the stability of a 40-weight oil during combustion.
Why Modern Engines Require Multi-Grade Oil for Optimal Performance
In the context of oil, the SAE J300 standard defines the viscosity grades for engine oils. Multi-Grade Oils Historically, drivers used single-grade oils that were suitable only for specific temperature ranges.
Defining SAE and Its Role in Viscosity Measurement The Society of Automotive Engineers is an international standards organization that develops technical guidelines for the aerospace, automotive, and commercial vehicle industries. An oil with a high viscosity flows slowly and resembles syrup, while a low viscosity oil flows quickly and resembles water.
Why Modern Engines Require Multi-Grade Oil for Optimal Performance
Conversely, the number following the "W" represents the oil's viscosity at high operating temperatures, typically 100°C (212°F). 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.
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