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SAE 40W refers to a specific viscosity grade of engine oil as defined by the Society of Automotive Engineers (SAE). The "40" indicates the oil's viscosity at high temperatures, meaning it maintains a certain thickness when the engine is operational. The "W" stands for "winter," signifying that this oil is suitable for winter use, although in this case, there is no low-temperature viscosity rating provided, as it is a single-grade oil. Essentially, SAE 40W is designed for use in warmer conditions where a thicker oil is beneficial for engine performance.

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1w ago

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