Multi-Grade Oils When looking at a bottle of oil, the numbers on the label—such as 10W-30 or 5W-20—represent a multi-grade formulation designed to function in varying temperatures. As the engine warms up, the oil thins and loses its ability to maintain a film between moving parts.
Understanding SAE Oil Viscosity Ratings and Their Meaning
Decoding the Numbers: Single vs. The designation on the container is not arbitrary; it is a standardized rating that communicates the oil's physical behavior at specific temperatures.
Hot Temperature Performance (The Second Number) While the "W" focuses on cold flow, the second number addresses the oil’s stability under heat. Conversely, using oil that is too thin can lead to increased oil consumption and insufficient lubrication under load.
Understanding SAE Viscosity Ratings for Engine Oil
The Origin and Purpose of the SAE Rating System The SAE rating system originated to create a uniform language for describing oil viscosity. This is why manufacturers in colder climates often recommend lower W-number oils to ensure reliable starts and reduced stress on the battery and starter motor.
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