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What happens if I put 5W30 in my car?

If you accidentally put 5W30 oil in your car instead of the recommended oil type, it's generally not a major issue. However, it's best to change the oil as soon as possible to the proper viscosity recommended by your vehicle's manufacturer.


Understanding Oil Viscosity


Oil viscosity refers to the thickness or fluidity of the oil. The "W" in 5W30 stands for "winter", indicating the oil's viscosity at colder temperatures. The number before the "W" (5) represents the oil's viscosity when the engine is cold, while the number after the "W" (30) represents the oil's viscosity when the engine is hot.


Most modern engines are designed to use 5W30 or 10W30 oil, as these viscosities provide the right balance of flow and protection across a range of temperatures. Using a 5W30 oil in an engine designed for 10W30 is generally not a problem, as the difference in viscosity is relatively small.


Potential Impacts of Using 5W30 Oil


Using 5W30 oil in an engine designed for 10W30 oil may have the following minor impacts:



  • Slightly reduced fuel efficiency: The thinner 5W30 oil may result in slightly higher engine friction, leading to a small decrease in fuel economy.

  • Increased oil consumption: The thinner 5W30 oil may leak or burn off slightly faster than the recommended 10W30 oil.

  • Reduced engine protection: The slightly lower viscosity of 5W30 oil may not provide as much protection for engine components during high-temperature operation, such as towing or hauling heavy loads.


These impacts are generally minor and unlikely to cause significant damage to your engine if the oil is changed back to the recommended viscosity soon after the incorrect oil is added.


Changing the Oil


If you have accidentally put 5W30 oil in your car, it's best to change the oil as soon as possible to the recommended viscosity. This will ensure your engine receives the proper lubrication and protection. Be sure to dispose of the old oil properly and refill your engine with the correct oil type and quantity.

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.