Can You Mix 5w30 And 5w20 Oil?

Can You Mix 5w30 And 5w20 Oil

Can you mix 5w30 and 5w20 oil? While we would keep emphasizing that mixing of motor oils is not advisable, we cannot oppose the fact that it is actually safe to mix different oils, especially when it’s from the same brand. That said, you may want to ask if it is okay to top-up 5W30 on a 5W20 engine.

Well, 5W30 and 5W20 will deliver the same performance and flow evenly at low temperatures. That sounds good to hear, right? Both oils will blend more perfectly if they are from the same brand and in the same API class.

Can You Mix 5w30 And 5w20 Oil?

As briefly answered in the intro paragraphs above, the simple answer is YES. It is entirely safe and okay to mix 5W30 and 5W20.

Whether you’re topping your 5W30 engine with 5W20 oil or vice versa, you are definitely not triggering any harm or potential damage to the engine’s core components.

Yes, the oils may have different additives; hence, the difference in their weight rating. But then, that doesn’t matter, the additives in the two oils won’t blend together per se, but it still doesn’t pose any harm to any part of your car engine.

The actual question here should be, “Why do you want to mix oils?” Yes, what’s your reason for wanting to mix different oils? Is your engine running low on oil, and you can’t get the exact one you’ve been using, or you just want to try out some new stuff?

Well, regardless of the reason behind your motive, you should drain out the new (irregular) oil after you have arrived at your destination and refill it with your regular oil.

However, whether you drain out the new oil and refill your old one (when you’ve got it) or not, your car would still be running fine.

In contrast, if you’re on a mission to completely change the oil you use for your car engine, we’d advise that you make extensive research regarding the potential disadvantages of not using your car manufacturer’s recommended oil.

What Actually Happens When You Mix 5W30 with 5W20?

What Actually Happens When You Mix 5W30 with 5W20

Nothing serious is going to happen. The oils will come together, but they are unlikely to blend into a single oil; so, they’d stay and flow separately. Since the two oils have the same viscosity for cold weather, they’d both flow evenly to the top ends in low temperatures.

Also, as said earlier, it would be best if the two oils you’re about to mix are from the same brand. This implies that the differences won’t be much, and that could mean better performance. Although, when you mix oils, your engine isn’t guaranteed to perform better due to incompatible additives in the oils.

5W30 will perform better if you drive in a state where the temperatures are always high. So to say, some drivers switch to thicker oils during the summer season and return to thinner oils when preparing for the winter season. If this is what you wish to practice, it is yet safe.


For the question, “Can you mix 5w30 and 5w20 oil?” the answer is yes, and it is best to go with oils from the same brand. Furthermore, we’d love to say that your car needs synthetic oils. Synthetics deliver a lot of benefits and promote the lifespan of motor engines.

It is also important to say that motor oils do degrade over time, and you should be careful not to use expired oil for your engine. Remember to change the oil filter for your engine – all these tips help ensure that you don’t face serious engine damage, which would likely burn a hole in your pocket.

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