How to Interpret Engine Oil Viscosity Codes: Your Complete Guide > 자유게시판

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When you look at a bottle of motor oil, you might see numbers like 15W-50 printed on the label. These numbers might seem confusing at first, but they are actually a simple way to describe how the oil behaves at different temperatures. This property is called fluid resistance, and it’s one of the essential factors in choosing the correct oil for your engine.

Viscosity refers to how dense or fluid a fluid is. Think of honey versus water. Honey is dense and sluggish—that’s increased resistance. Water is thin and flows easily—that’s reduced thickness. Engine oil needs to be adequately viscous to cushion engine parts from rubbing together, but light enough for rapid circulation when the engine starts, especially in winter temps.

The numbers on the oil bottle are a two-part system. The preceding number, followed by the letter w, stands for cold weather. This tells you how well the oil maintains fluidity at sub-zero environments. For example, in 10W-40, the 0 means the oil remains fluid in freezing temperatures. A lower number like 5W means the oil is thinner when cold, which helps the engine start more easily in winter. A higher number like 20W means the oil is more viscous in chill and may not flow as quickly in freezing temperatures.

The following number, after the w, tells you how viscous the oil is at 100°C, which is about engine’s optimal thermal range. In 10W-40, the 40 means the oil has a medium thickness when hot. Heavier grades like 50 mean the oil resists thinning when the engine is running hot, which can be better for turbocharged engines that generate more friction.

The w in the middle stands for cold-weather performance, and it’s there to show that the oil has been certified for performance in dual climate environments. Modern oils are called all-season oils because they can maintain stability across a extensive climate zones. They contain viscosity modifiers that help them adapt to temperature shifts.

Choosing the appropriate rating matters. If you use oil that’s inadequately fluid in chill, your engine may not get enough lubrication, leading to extra wear. If you use oil that’s too thin when hot, it might not protect engine parts properly under performance driving. Always check your vehicle’s service guide for the manufacturer’s recommended viscosity. Using the right oil helps your engine operate efficiently, last longer, اتوسرویس داوود and can even enhance economy.

In summary, the numbers on your oil bottle are a code to how the oil functions in extreme climate scenarios. The first number before the w tells you about start-up efficiency, and the post-W value after the W tells you about high-temp stability. Understanding these numbers helps you make a informed decision for your car’s longevity.