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How to Read Engine Oil Specifications?

1 Answers
AdalynnRose
07/30/25 3:57am
To read engine oil specifications, look for the SAE and API markings on the oil's outer packaging. The number following SAE indicates the oil's viscosity value, while the number after API denotes the oil's quality grade. The 'W' in the grading stands for Winter, and a smaller number before the 'W' indicates better low-temperature fluidity of the oil. The number after the 'W' represents the oil's high-temperature resistance, with a higher number indicating better protective performance at high temperatures. Engine oil specifications consist of two parts: the grading and viscosity specifications, typically used to indicate viscosity and quality. SAE in the specifications is the abbreviation for the Society of Automotive Engineers, and API stands for the American Petroleum Institute.
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