What Happens if I Use 5W30 Instead of 5W40 Oil in My Car?

Using 5w30 instead of 5w40 may cause some damage to your engine, as they have different viscosity levels. It can potentially harm the engine’s performance and longevity.

Your car’s engine requires oil to keep its internal components lubricated, cool, and clean. The type of oil you use and the viscosity level have an impact on its performance. Viscosity is the oil’s resistance to flow and is indicated by the w in the oil grade, such as 5w30 or 5w40. The first number indicates the cold flow rate, while the second number indicates the oil’s viscosity at high temperatures. 5w40 oil is thicker than the 5w30, which means it can offer better protection in high temperatures and help reduce engine wear.

Using 5w30 instead of 5w40 means that the oil may not flow optimally in high temperatures, causing damage to the engine components. So, it is essential to stick to the manufacturer’s recommended oil grade to ensure your engine runs smoothly and efficiently.

What Happens if I Use 5W30 Instead of 5W40 Oil in My Car?

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The Difference Between 5W30 And 5W40 Oil

Motor oil is classified with a viscosity rating system. The first number represents the cold-weather viscosity, known as the “winter weight,” and the second number represents the high-temperature viscosity, known as the “summer weight. ” 5w30 is thinner than 5w40, which is thicker and has better high-temperature protection.

5w30 is suitable for colder environments, while 5w40 is ideal for warmer temperatures and heavy-duty driving conditions that require more robust protection. Follow your vehicle’s oil recommendations to select the right oil that matches the manufacturer’s recommended viscosity grade. Choosing the right oil will optimize engine performance and help prolong engine life.

What Can Happen If You Use 5W30 Instead Of 5W40 Oil

Putting 5w30 oil in place of 5w40 can cause a number of issues. First, it can lead to increased wear and tear on the engine, resulting in reduced performance and fuel economy. Additionally, the engine may be at risk of damage and overheating, as the oil may not provide sufficient lubrication.

It’s important to always use the proper grade of oil recommended by the manufacturer to ensure the longevity and optimal function of your engine. Don’t risk costly repairs and damage by using the wrong oil.

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Frequently Asked Questions On What Happens If I Put 5W30 Instead Of 5W40

Can I Use 5W30 Instead Of 5W40?

Yes, you can use 5w30 instead of 5w40. The viscosity difference will not cause damage, but it may affect engine performance.

What’S The Difference Between 5W30 And 5W40?

The main difference between 5w30 and 5w40 is their viscosity at different temperatures. 5w30 is thinner at low temperatures, while 5w40 is thicker at low temperatures.

What Happens If I Use The Wrong Engine Oil?

Using the wrong engine oil may cause decreased engine performance, increased fuel consumption, and engine damage in extreme cases.


By now, you should have a good understanding of what happens if you put 5w30 instead of 5w40 in your vehicle. While it may not seem like a big deal, the potential consequences are not worth the risk. Over time, using the wrong oil viscosity can lead to engine damage, reduced performance, and even higher repair costs.

It’s important to always check your owner’s manual to ensure you are using the correct oil for your vehicle. While some may argue that you can get away with using the wrong oil for a short period of time, it’s better to err on the side of caution and use the recommended oil.

Always remember that the right oil can keep your engine running smoothly and efficiently for many years to come. So be sure to prioritize your vehicle’s maintenance and always use the correct oil viscosity to avoid bigger problems down the road.