What Does the Engine Oil Model Number Represent?

[McDallas]

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.

[HenryMarie]

The oil model, such as 5W-30, is essentially a code representing the oil's characteristics. The 'W' stands for winter viscosity, and the number '5' indicates the fluidity at low temperatures—the smaller the number, the easier the cold start. The '-30' represents high-temperature viscosity, where a larger number means better protection at high temperatures. This directly affects engine lifespan—choosing the wrong type may lead to faster wear or higher fuel consumption. When I bought my car, I didn't understand and used the wrong oil, making winter starts difficult and increasing fuel consumption. It's recommended to check the car manual for the recommended model and pay attention to API standards during maintenance, such as 'SN,' which indicates higher performance levels and can reduce carbon buildup. Regular oil changes are crucial—don't slack off, as it saves repair costs and ensures safety.

[McRyder]

The oil model designation, such as 5W-30, is divided into viscosity grades. 5W refers to the low-temperature viscosity in winter; the lower the viscosity, the smoother the cold start. 30 is the high-temperature viscosity, ensuring thick oil film at high temperatures to protect the engine. API grades like SP indicate excellent environmental and cleaning performance, reducing emissions. When choosing oil, don't just look at the price; consider seasonal changes and driving habits. I've tried using oils of different viscosities; when driving at high speeds with insufficient viscosity at high temperatures, the engine made severe abnormal noises. Checking the oil label is straightforward—don't skip it.

[Shawn]

As a daily driver, the oil viscosity grade affects driving comfort. 5W-30 provides quick cold starts in winter, effortless lubrication in summer, reduced noise, and better fuel efficiency. Using the wrong grade makes winter ignition difficult, increases fuel consumption, and damages the engine. When I used incorrect oil, my car became noisy and sluggish during acceleration. Consulting the manual for the right grade is crucial – don't delay oil change intervals. Choosing the proper oil delivers noticeable improvements: quieter operation, better fuel economy, and longer engine life.

[LeTeagan]

Engine oil grades involve environmental considerations. The 5W-30 design focuses on fuel efficiency and energy conservation, with API standards like SP reducing ash content to lower pollution. Choosing the right grade not only protects your vehicle but also safeguards the environment by reducing carbon emissions. Fully synthetic oils are more sustainable. I prefer eco-friendly choices and insist on using compliant oil products. Properly recycling used oil during oil changes benefits the environment—simple maintenance habits with effective results.