Can you mix different weights of oil?

Can oils of different grades be mixed? The good news is that mixing different types of oil it will not harm your engine in any way in the short run. Most synthetic and semi-synthetic engine oils are based on regular oil and are compatible.
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Is it OK to mix different weight oils?

The truth is simple: don't mix two different oils that have different weights (viscosities). Viscosity Grades might sound pretty scientific, but the simple fact is that this is what keeps your engine running smoothly. A common question is whether you can mix 5w30 and 10w40.
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Can you mix 20 and 30 weight oil?

Yes, you can mix 5W20 and 5W30 oil. However, your engine MUST support it. Both oils should be of the same brand to prevent engine damage and should also be of a similar API service level.
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Can you mix 5w 30 and 10w 30?

It is still not a good idea to mix two different brands of oil, even if they have the same viscosity. The oil you use should be the grade recommended by your car manufacturer. However, if you mix two different brands of motor oil, you could damage your vehicle.
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Can you mix 10w30 and 5W20?

Notwithstanding the recommendations of the car manufacturer, mixing 10w30 and 5w20 will not cause any sort of harm to the engine. However, a few drivers claim that it is safer to combine two multi-grade or straight weight oils, rather than mixing multi-grade with straight weight oils.
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Will Mixing 10 Motor Oils Damage an Engine? Let's find out!



Can I add 10w40 to 5w20?

The answer is yes, but not straight weights or multigrades.
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What if I put 10w30 instead of 5w20?

The lower the number before W, thinner is the oil viscosity. Moreover, many of us know that thinner oil is easy to ignite even at the temperature below negatives. Therefore, if the temperature is below zeros, use 5w20 oil. In the same case, 10w30 oil can take hours to ignite in winters.
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What happens when you mix oil viscosities?

What Happens If You Mix Engine Oil Viscosity? A higher viscosity motor oil will also reduce the efficiency of your car's fuel economy. As a result, thicker motor oil is more resistant to metal components, such as pistons, which are vital to the operation of the engine.
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Can I mix 5W30 and 10W40?

Is It Ok To Mix 10w40 With 5w30? The brand should be the same as the product. It is not compatible with the additives to mix brands.
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Can you mix 10W30 and 10W40?

Mixing 10W30 with 10W40

Some say that mixing them is fine as long as you don't live in freezing weather. Even if you put together synthetic and conventional blends of these motor oils, they show no harm to your vehicle. However, this is true only if you mix in a quart of the other type to your usual engine oil.
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Will it hurt to put 5W30 in a 5W20 engine?

You risk putting your engine in harm's way by using an oil that your engine isn't designed around. Remember, thinner motor oil (5W20) will flow through your engine better than 5W30. During winter weather, stick with 5W20 unless directed otherwise.
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What happens if you mix 5W 20 and 5W-30?

Yes, you can top up your 5W20 with 5W30 or the other way around. Keep in mind that it's probably not a good idea to mix the two oils, because 5W30 is thicker than 5W20 but the mixture won't harm the engine anyway. It's generally accepted that mixing different weights is better than using one weight for your engine.
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Can you switch from 5W20 to 5W30?

There is no need to do this. Although both 5w30 and 5w20 have the same winter rating of 5, the thickness (viscosity) of 5w30 is a bit higher.
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Can you mix 5W 40 with 15W 40?

everything ive ever read has always said never mix different weights of oil. the life of the synthetic amsoil will not be as long when you mix it with the regular oil. Wrong. Mixing a dino with a syn, a syn with a dino, a 5W-40 with a 15W-40, and so on is fine.
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What happens if you mix 10w40 with 15w40?

There is absolutely no harm in mixing different grades of engine oil! All motor oils are required to comply with international standards which include a compatibility test. This means that any branded engine oil will mix with the standard test oil in any proportions and the mixture will still perform as specified.
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Can I mix 5w30 and 5w40?

you can mix 5w30 with 5w40, you won't notice much of a difference in regular temperatures, but if you have a high-end, luxury car or performance car, it might be a good idea to use the only 5w40, even in emergencies, as it might cause inconsistencies especially under load which can lead to unwanted damage.
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Can you mix 10W 40 and 5W 40 oil?

Registered. As long as both oils have the same C-classification, or at least close -no problem in mixing different weights.
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Can you mix two different engine oils?

The good news is that mixing different types of oil it will not harm your engine in any way in the short run. Most synthetic and semi-synthetic engine oils are based on regular oil and are compatible.
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What happens if I use 5w30 instead of 10w40?

The 5w30 oil will flow better at low temperatures than the 10w40 oil. This means that the 5w30 oil will protect the engine better at low temperatures, usually when the engine is just starting or during weather conditions such as winter.
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Can you mix 5w30 and 0w20?

Yes, just that. Pennzoil Platinum is a thin 30 or Valvoline Advanced also in 5w-30. Both syn oils. If you are in that part of NorCal where it's truly -10 or more, consider M1 AFE 0w-30.
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Can I use different viscosity motor oil?

It's best to use the oil viscosity recommended in the owner's manual, but using a slightly thinner or thicker oil (lighter or heavier viscosity) generally poses no long-term harm.
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Can you mix oil of the same viscosity?

THE ANSWER IS NO!

Even if two different brands of oil have the same viscosity, you still should not be mixing them together.
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What happens if I put 10w40 instead of 5w20?

Lose a little gas. mileage and lubrication is not as good plus it puts more strain on the oil pump. Never go thicker than a 5w30 and that would be more for an older higher mileage engine in warmer climates. So go change it back to 5w20.
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Is 10w30 better for high mileage?

10W-30 motor oil makes for a decent high-mileage oil. It gives a better fuel economy while reducing the oil consumption for older engines. Older engines with more than 75,000 miles on them require a thicker oil that will properly lubricate their critical engine parts and prevent oil leaks, sludge, and deposits.
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What's the difference between 5W 30 and 10W 30?

Both the oils have similar viscosity at 100 degrees Celsius but 5w30 grade oil will thicken less than 10w30 grade oil in cold climate. This means 5w30 grade oil will flow effectively in low temperatures, whereas 10w30 oil will flow effectively in high temperatures because of the smaller temperature window.
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