Using 5W-30 oil instead of the recommended 5W-20 oil in your car can have some implications.  Here’s what you need to know:
Viscosity Difference: The numbers in the oil rating (e.g., 5W-20, 5W-30) represent the oil’s viscosity. The first number (5W) indicates the oil’s viscosity at low temperatures, while the second number (20 or 30) represents the viscosity at operating temperatures. The lower the number, the thinner the oil.
Manufacturer Recommendations: It is generally best to follow the viscosity recommended by the car manufacturer, which can be found in the owner’s manual or on the oil cap. While it is generally acceptable to use an oil that is one viscosity rating higher or lower, it is best to use the viscosity specified by the manufacturer.
Effects of Using 5W-30 instead of 5W-20:
– Cold Start: When the engine is cold, both 5W-20 and 5W-30 oils have the same viscosity. So, using 5W-30 oil instead of 5W-20 during cold starts should not cause any immediate issues.
– Operating Temperature: The main concern arises when the engine reaches its operating temperature. 5W-30 oil is thicker than 5W-20 oil at operating temperatures, which means it may not flow as freely through the engine components. This can potentially lead to reduced lubrication and increased wear on engine parts.
Potential Problems:
– Reduced Fuel Efficiency: Thicker oil, such as 5W-30, can create more internal friction, which may result in slightly reduced fuel efficiency.
– Increased Oil Consumption: Thicker oil may also contribute to increased oil consumption, as it may not provide optimal sealing and lubrication for certain engine components.
– Warranty Concerns: Using oil types that are not recommended by the car manufacturer can potentially void the engine warranty.
Driving Until the Next Oil Change:
– If you accidentally used 5W-30 oil instead of 5W-20, it is generally recommended to have it corrected as soon as possible.
– Driving until the next oil change interval should not cause immediate catastrophic damage, especially if the engine is not experiencing any issues. However, it is still advisable to have the oil changed to the correct viscosity at the earliest convenience to ensure optimal engine performance and longevity.
The automakers don’t suggest using particular oil grades out of a whim. Contemporary engines require tight tolerances. Thus, the use of 5W-20 instead of 5W-30 will result in slight gains in fuel economy and oil lubrication as required. More viscous oil will reduce the economy by some tiny amounts and affect engine performance, particularly when it comes to variable valve timing.  Still, it is unlikely that anyone will be able to notice the difference.
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