Can I mix 5W20 and 10W30?

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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What is the difference between 10w30 and 5W20?

10W30 is thicker and protect older engine with its sealing capability. 5W20 is thinner multi-grade oil that is pertinent for quick starts in the lowest temperatures. In order to protect your car from internal damages, it is beneficial to use only specified engine oil by the manufacturers.
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What happens if you mix different weight oil?

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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Can I put 10w30 in 5w 30?

Can I Mix 10w30 and 5w30? Most oils will mix perfectly, provided they have a similar synthetic. Therefore, there is no problem in mixing 10w30 and 5w30 since one will be topping up. Mixing the viscosity of oils will not have any effect on the engine.
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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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Will Mixing 10 Motor Oils Damage an Engine? Let's find out!



Does 5W or 10W matter?

A 10W or 5W is the index for how easily the oil flows in winter (hence the W). A 10W oil thickens more than a 5W. The other number indicates the oil's resistance to thinning at high temperatures.
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Can I mix 2 different engine oils?

WHAT ABOUT MIXING ENGINE OIL BRANDS? Yes. It won't harm your engine to mix, for example, Quaker State® motor oil with Pennzoil, as long as the oil you use is the weight (or viscosity) recommended in your vehicle owner's manual.
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Can you mix two different types of motor oil?

Yes, you can safely mix one brand of oil (e.g. Mobil 1) with a different brand (e.g. AMSOIL) or conventional oil with synthetic oil (in fact, that's what a synthetic blend is). Most synthetics today are fully compatible with conventional oils and can safely be mixed.
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Is it OK to mix different oil 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 oil can I substitute for 5W-20?

As 5W-20 is a low viscosity oil, it's best suited for cars that drive a lot in low temperatures and colder climates. It's ideally recommended for light-duty petrol and gasoline engines, and can help with engine deposits and wear and tear problems. For a higher temperature climate, you may use 10W-30 as an alternative.
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Is 5w20 good for winter?

5W20 motor oil is another low-temperature grade typically recommended for winter use, with a 10W-30 as an alternative for higher temperatures. This oil type is common because it provides the best fuel economy, saves fuel consumption, and has fewer exhaust emissions.
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Can you mix oils of the same weight?

They're all pretty much made by the same companies in the same assembly lines anyways. Don't mix weights or synthetic and non synthetic. You'll be okay.
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Can I top up oil with different oil?

You can add any engine oil as long as it has the right specifications — preferably with an official approval of the OEM (Original Equipment Manufacturer). Not the brand, but the specification and viscosity indicated in your car's manual are your reference for using the right oil.
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What happens if you mix synthetic oil with regular oil?

So, in the end, conventional and synthetic oils are comprised of the same, compatible components – it's just that the components in synthetics are much higher quality. While you can safely mix synthetic and conventional oils, you're doing nothing more than diluting the performance of the synthetic oil.
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Can I mix oils in my car?

You can indeed use the same oil weight already in the vehicle, but mixing weights just isn't recommended.
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Can I top up engine oil when engine is hot?

Adding Oil When The Engine Is Hot

If you're not changing the oil and only are adding oil, you can do so when it's hot without a problem. The cold oil will not harm your hot engine. If you're measuring the oil first, you should let your vehicle cool off first, though.
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Will thinner oils damage your engine?

Just like using an oil with too high a viscosity may lead to problems in Brad's engine, using a thinner oil can have the same result. Oil that's too thin can fail to develop a consistent lubricating film, inviting metal-to-metal contact that causes wear. Extreme stress and heat add to the challenge.
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Will the wrong oil damage my engine?

Cause damage to engine life

The wrong engine oil can cause engine damage because it does not properly lubricate its components. This will lead to metal-on-metal contact since the moving parts are not being lubricated. Friction quickly follows, causing engine parts to wear.
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Is 10w30 good for winter?

10W-30 motor oil is recommended for ambient temperatures not exceeding -30°C/-22°F in the winter or 35°C/95°F in the summer. This is a great motor oil to use if you live in Canada or cooler U.S. states. Colder regions would require 5W-20, while hotter regions may call for 10W-40.
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Is 5W-30 oil better than 10w30?

5W-30 multi grade oil is ideal for private vehicles and light-duty petrol and diesel engines. It also provides a better cold temperature start than 10W-30 oil. On the other hand, the slightly thicker oil,10W-30, provides better lubrication for commercial vehicles and heavy-load engine cars.
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When to use 5W-30 vs 10W-30?

As per API recommendations (1) for car engines, you can use 10W–30 oil if the maximum expected outside temperature is above -18°C (0°F). If you are living in an area where the outside temperature can go below zero; It is better to use 5W–30.
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Should I run my car after adding oil?

Once you have your oil, make sure your car is again parked on level ground. Your engine should be cool, and you should wait at least 20 minutes to give the oil time to drain fully back into the sump.
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Can I use 10w30 instead of 5w20?

Lubrication

In terms of lubrication, 5w20 is better than 10w30. It is perfect for light-duty petrol and diesel engines as well as private vehicles, while 10w30 works best for cars that bear heavy loads and commercial vehicles.
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Is 5W-20 oil good for summer?

You'll get better protection with 5W 30 oil in cold as well as hotter climates. 5W-20 oil is best for those who live in colder climates with low temperatures. It can be used for light-duty applications, for engines that do not reach very extreme temperatures.
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Is 5W-20 A thin oil?

So, due to viscosity, 5w20 is a thinner oil during operating temperatures, whereas 5w30 is thicker during operating temperatures.
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