When you open a bottle of motor oil, you might notice numbers on the label like “5W-30” or “10W-40.” But what do these numbers really mean? It’s easy to think they’re just some random codes, but they’re packed with important information about the oil’s performance.

Understanding these numbers and the different types of oil can help you take better care of your car or any machine that uses oil. It’s not just about picking any oil viscosity and pouring it in; it’s about choosing the right one to keep everything running smoothly.

In this piece, we’re going to talk about what these numbers and terms really mean, so you can make smarter choices for your vehicle. Let’s get started:

What Is Motor Oil?

Motor oil is the lifeblood of your car’s engine. It serves multiple purposes: lubricating the engine’s moving parts to reduce friction, cooling the engine by carrying heat away from the parts, cleaning by trapping dirt and debris, and protecting against corrosion. Without oil, the engine’s parts would grind against each other, leading to wear and tear, overheating, and even total engine failure.

But not all motor oils are the same. They come in different types and viscosities, which is where those confusing numbers come in. Understanding these differences can help you choose the right oil for your car, depending on factors like the weather, your driving style, and the specific needs of your engine.