These oils utilize polymer technology to provide the benefits of two different viscosities in one product. The number after the dash indicates the oil's viscosity at 220 degrees Fahrenheit, reflecting its stability and thickness when the engine is hot.
Understanding SAE Reality in Oil Additives
In contrast, single-grade oils, which carry only a single number like SAE 30, are typically used in specific applications such as small engines or older vehicles that do not operate in varied climates. Engine friction generates intense heat, causing oil to thin out and lose its lubricating properties.
Decoding the SAE Viscosity Rating The numbers and letters printed on a oil can, such as 5W-30 or 10W-40, represent a precise measurement of flow characteristics. In contrast, single-grade oils, which carry only a single number like SAE 30, are typically used in specific applications such as small engines or older vehicles that do not operate in varied climates.
Understanding SAE Reality in Oil Additives
Engineers formulate oil with specific additives to balance these opposing forces, ensuring the film remains intact to protect metal surfaces whether the thermometer reads twenty degrees below zero or one hundred degrees above it. Conversely, cold weather causes oil to thicken, making it difficult to pump through the engine.
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