What Happens When Using Thicker Oil Viscosity in Vehicle Engines?

• What is the viscosity of engine oil? Is it important?
• What do the specifications on the oil container mean?
• What happens if you use a thicker oil in the engine?

Viscosity is an important factor that affects the performance and lifespan of the engine.

1. What is viscosity?

2. Engines are designed to operate with a specific viscosity of engine oil.

• Using oil with too high a viscosity will make it difficult for the oil to flow into the engine components, reducing lubrication efficiency and increasing friction. This can lead to noise, reduced power output, increased fuel consumption, and elevated engine temperature.
• Conversely, oil that flows too quickly through engine components may decrease pressure and lubricating capability. This can cause wear and damage to engine parts.

You should use oil with a viscosity suitable for the operating conditions and climate of your vehicle.

3. Thicker oil may not flow quickly enough.

High viscosity oil does not conduct heat as well as low viscosity oil.

4. Some viscosity differences in oil are less noticeable.

5. Thinner oil may flow faster.

6. Summary on using thicker or thinner oil.

• Using oil with the recommended viscosity is the best choice to protect and optimize engine performance, helping you maintain your vehicle's warranty.
• Using oil with a viscosity one grade higher or lower than recommended may not cause long-term harm to the engine, but it also does not provide any benefits. You should only do this when you have no alternative or when you fully understand the reasons and consequences of such a decision.
• Using oil with a viscosity significantly higher or lower than recommended is the worst choice as it can cause issues for the engine and void your vehicle's warranty. You should not change the type of oil without understanding its properties and effects on the engine.

The article and images are compiled by Huynh Chau.