The number before the W is tested at extremely low temperatures to simulate a cold start. The testing procedures defined by the SAE involve specific measurements of the oil's flow characteristics.
Understanding SAE Cold Weather Ratings and What They Mean
SAE is an abbreviation for the Society of Automotive Engineers, the organization that establishes the standards for oil viscosity. In contrast, older single-grade oils, such as straight 30-weight or 40-weight, maintain a relatively consistent viscosity but are less adaptable to temperature fluctuations.
The viscosity grade, which you see formatted as "SAE XW-XX," is a universal rating system that tells you how the oil behaves at different temperatures, ensuring compatibility with your engine regardless of the weather. The number after the hyphen is tested at the high temperatures and shear forces found in a running engine.
Understanding SAE Cold Weather Viscosity Testing
Think of viscosity in terms of water versus honey; water flows easily (low viscosity) while honey is slow and sticky (high viscosity). How SAE Ratings Impact Engine Performance Choosing the correct SAE rating is not just a matter of preference; it is a fundamental requirement for engine health and efficiency.
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