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Can I put 5w30 in my car if it takes 5w20?

The short answer is that it is generally not recommended to put 5W30 motor oil in a car that requires 5W20. While it may be possible in some cases, it is important to follow the manufacturer's recommendations for the proper oil viscosity to ensure the engine's optimal performance and longevity.


Understanding Oil Viscosity


Motor oil viscosity is a measure of the oil's resistance to flow, and it is typically expressed using a two-number designation, such as 5W20 or 5W30. The first number (5 in this case) indicates the oil's viscosity at low temperatures, while the second number (20 or 30) indicates the oil's viscosity at high temperatures.


The "W" in the designation stands for "winter," and it refers to the oil's ability to flow at cold temperatures, which is important for engine start-up and lubrication during the initial moments of operation.


Differences Between 5W20 and 5W30



  • Viscosity: 5W30 oil has a higher viscosity than 5W20 oil, meaning it is thicker and more resistant to flow. This can affect the engine's fuel efficiency and performance.

  • Temperature Range: 5W20 oil is designed to perform better in colder temperatures, while 5W30 oil is better suited for warmer climates or higher-performance engines.

  • Manufacturer Recommendations: Car manufacturers specify the recommended oil viscosity based on the engine's design, lubrication requirements, and other factors. Using the wrong viscosity can lead to increased wear, reduced fuel efficiency, and potentially even engine damage.


In general, it is best to follow the manufacturer's recommendations for the appropriate oil viscosity, as they have designed the engine to work optimally with a specific oil type.


Potential Consequences of Using 5W30 Instead of 5W20


Using 5W30 oil in a car that requires 5W20 can have several potential consequences:



  • Reduced Fuel Efficiency: The thicker 5W30 oil may increase the engine's resistance to motion, leading to a slight decrease in fuel efficiency.

  • Increased Wear: The higher viscosity of 5W30 oil may not provide the same level of protection and lubrication as the recommended 5W20 oil, potentially leading to increased wear on engine components over time.

  • Reduced Performance: The thicker oil may affect the engine's ability to respond quickly, potentially reducing overall performance.

  • Potential Engine Damage: In some cases, using the wrong oil viscosity can lead to more serious issues, such as increased oil pressure, oil leaks, or even engine damage.


It's important to note that the potential consequences can vary depending on the specific engine, driving conditions, and other factors. In some cases, using 5W30 oil in a 5W20 engine may not cause immediate issues, but it is generally not recommended as a long-term solution.


Conclusion


In summary, while it may be possible to use 5W30 oil in a car that requires 5W20, it is generally not recommended. The differences in viscosity and temperature performance can lead to reduced fuel efficiency, increased wear, and potentially even engine damage. For the best performance and longevity of your vehicle, it is always best to follow the manufacturer's recommendations for the appropriate oil viscosity.

Can I use 5w30 instead of 5w20 in a high mileage engine?


If 5w20 is not available there is absolutely nothing wrong in using 5w30. And for a high mileage car 5w30 will offer better protection depending on the condition of the engine. Even some manufacturers that recommend 5w20 still recommend 5w30 if car is old and will be driven in temperate regions most of the times.



Is it OK to use thicker oil in high mileage engine?


Using a thicker oil or one with a higher viscosity may also be helpful once your car reaches 100,000 miles. Or you can opt for oil additives that help stop leaks.



Can I use 5W-30 instead of 5W20 in my Hyundai?


As for the Hyundai Elantra recommended oil type, you can choose either of these grades in conventional or synthetic oil: 5W-20. 5W-30.



Can I use 5W-30 instead of 5w20 in my Hyundai?


As for the Hyundai Elantra recommended oil type, you can choose either of these grades in conventional or synthetic oil: 5W-20. 5W-30.



What happens if you put 5w30 in a 5w20 engine?


Using 5W-30 instead can reduce fuel economy and impede flow throughout the engine. While using it temporarily in a pinch likely won't cause your engine lasting harm, remember that the engineers who built your engine did so with a specific viscosity oil in mind, meaning it's best to stick with it.



What oil can I substitute for 5w20?


0W20 should be a acceptable substitute for 5W20, as it will (should) be in the apropriate viscosity range over the same temperature range.



What happens if you use the wrong engine oil?


Using the wrong type can wreak havoc on your engine, causing moving parts to wear prematurely due to inadequate lubrication. This can lead to costly repairs, replacement parts, and engine failure.



Will switching oil types harm the engine?


When it comes to doing oil changes, switching between synthetic and conventional oil is perfectly okay. Despite the oil myths, both oil types are compatible with each other – no engine flush needed. So, simply making the switch will not cause any damage to your engine nor impact your travels.



What happens if you use regular oil instead of synthetic oil in your car?


Using non-synthetic oil in an engine designed for synthetic oil can lead to increased wear, reduced efficiency, and potentially shorter engine life. If your vehicle manufacturer recommends synthetic oil, it's best to adhere to that recommendation.



Why can't you go back to regular oil after synthetic?


Myth: Once you switch to synthetic oil, you can never switch back. This is one of the most persistent myths about synthetic oil—and completely untrue. You can switch back and forth at any time. In fact, synthetic blends are simply a mixture of synthetic and conventional oils.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.