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What Does the Engine Oil Model Number Represent?

1 Answers

McDallas

07/30/25 2:12am

Engine oil model numbers consist of two parts: classification and viscosity specifications. Here are the relevant details: 1. Oil viscosity: On the outer packaging of engine oil, we often see SAE and API. SAE stands for the Society of Automotive Engineers, and API stands for the American Petroleum Institute. The number following SAE indicates the oil's viscosity value, while the number following API indicates the oil's quality grade. 2. The meaning of "W": "W" stands for "winter," and the number preceding it indicates the oil's low-temperature fluidity. The smaller the number before "W," the better the oil's low-temperature fluidity, representing a lower usable environmental temperature and better protection for the engine during cold starts. 3. High-temperature resistance: The number following "W" (after the hyphen) indicates the oil's high-temperature resistance. A higher number means better protection performance at high temperatures. 4. Pour point temperature: The number before "W" represents the pour point temperature, simply put, the freezing point temperature. For example, 10W oil corresponds to a freezing point temperature of -25°C.

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