What Does 10W-40 Mean? A Simple Guide to Engine Oil

What Does 10W-40 Mean?

If you've ever looked at an engine oil bottle, you may have seen numbers such as 10W-40.

But what do these numbers actually mean?

10W-40 is a viscosity grade that describes how the engine oil flows at different temperatures.

What Does "10W" Mean?

The 10W refers to how the oil flows at lower temperatures.

The W stands for Winter, not "weight".

A lower number generally means the oil flows more easily when the engine is cold.

What Does "40" Mean?

The 40 represents the oil's viscosity when the engine is operating at higher temperatures.

Compared with a lower viscosity grade, 10W-40 remains relatively thicker when the engine is hot.

Is 10W-40 Suitable for Your Car?

It depends on your vehicle.

Some engines are designed to use 10W-40, while others require different viscosity grades such as 5W-30 or 5W-40.

Always check your vehicle owner's manual or manufacturer's recommendation before choosing engine oil.

Choose the Right Engine Oil

The correct engine oil should match your vehicle's recommended viscosity and performance specification.

With MOREV, choose an oil that suits your vehicle and driving requirements.

MOREV — Reliable Protection. Smooth Performance.