A Complete Guide to Mixing 5W30 and 5W20
When it comes to vehicle maintenance, oil is one of the most critical elements to consider. As a car owner, you may have wondered whether it’s safe to mix 5W30 and 5W20 motor oils. While this might seem like a simple fix in a pinch, it's important to understand the potential consequences of doing so and whether it's the right choice for your vehicle. In this guide, we'll explore the effects of mixing these oils and provide insights into when you can and can't blend them.

What Are 5W30 and 5W20 Oils?
Before diving into the topic of mixing, let's first understand what 5W30 and 5W20 oils are.
5W30: This motor oil has a visibility rating of 5 when the engine is cold (denoted by "W" for winter) and 30 when the engine is at operating temperature. It’s thicker than 5W20, making it suitable for a wide range of temperatures and offering more protection in higher temperatures.
5W20: Similarly, 5W20 has a visibility rating of 5 when cold and 20 when at operating temperature. It’s a lighter oil, providing better fuel efficiency, and it’s generally recommended for colder climates or vehicles with engines designed to run with lighter oils.
Can You Mix 5W30 and 5W20?
Technically, you can mix 5W30 and 5W20 oils. Both are multi-viscosity oils, which means they perform well in a range of temperatures. However, mixing oils with different viscosities can have some consequences.
The Consequences of Mixing
Reduced Protection: 5W30 is thicker than 5W20 at operating temperature. When you mix them, the resulting oil will have a viscosity somewhere in between the two, but it might not provide the optimal protection you need for your engine.
Inconsistent Performance: The mixed oil may not perform as effectively as the specified oil for your car. Some engines are designed to run on a specific oil grade, and mixing oils with different viscosities can lead to inconsistent lubrication, increasing the risk of wear.
Impact on Fuel Efficiency: Since 5W20 is lighter and designed for better fuel efficiency, mixing it with the thicker 5W30 could reduce your engine's overall fuel efficiency. The mixed oil may not flow as smoothly, leading to increased friction and decreased mileage.
When Is It Okay to Mix 5W30 and 5W20?
While mixing these oils isn't ideal, it's usually okay in emergencies. If you're low on oil and don't have time to go to an auto shop, you can mix them to get to your destination. However, this should only be a temporary solution. It's essential to drain the mixed oil and replace it with the manufacturer-recommended oil as soon as possible.
Potential Risks of Mixing 5W30 and 5W20
Voiding the Warranty: Some manufacturers have strict guidelines regarding the type of oil used in a vehicle. Mixing oils may lead to warranty issues if the manufacturer requires specific oil grades for engine longevity.
Long-Term Engine Damage: Prolonged use of mixed oils can lead to overheating, higher engine wear, and decreased performance. It can also cause the engine to work harder than necessary, reducing its overall lifespan.
Conclusion
While you can blend 5W30 and 5W20 oils in an emergency, it’s not the best option for your engine. The best practice is to use the recommended oil grade specified by your vehicle’s manufacturer. This ensures your engine runs smoothly, with optimal protection and performance.
For more information on oil maintenance or to get your car's oil changed, visit Jordi’s Tire Shop.

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