A 0W or 5W oil flows more readily in extreme cold than a 15W oil, reducing the time the engine spends without protection. The Origin and Purpose of the SAE Rating System The SAE rating system originated to create a uniform language for describing oil viscosity.
Understanding SAE Oil Grade Meaning and Viscosity Ratings
The oil must be thick enough to maintain a strong oil film to prevent metal contact, yet thin enough to flow efficiently through the engine’s intricate passages and oil filter. When an engine is turned off, oil drains back into the sump, leaving critical components dry.
Hot Temperature Performance (The Second Number) While the "W" focuses on cold flow, the second number addresses the oil’s stability under heat. The designation on the container is not arbitrary; it is a standardized rating that communicates the oil's physical behavior at specific temperatures.
Understanding SAE Oil Grade Ratings and Their Meaning
Before this standard existed, manufacturers used inconsistent methods to describe how thick or thin their oils were, leading to confusion and improper selection. This numerical code, developed by the Society of Automotive Engineers, directly impacts engine protection, fuel efficiency, and overall longevity, making it one of the most critical specifications to check before an oil change.
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