Can I 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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Does 10W40 hurt 10W30 engine?

If you were to put 10W40 in an engine designed for 10W30, the “thicker” oil would lead to friction in the engine and an increased load on the oil pump. The car would have to do more work to get the oil around the engine block.
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Can you mix oil weights?

Given that standards are in place, does that mean you can mix and match oil weights? 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.
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Which oil is heavier 10W30 or 10W40?

The quick answer is 10W40 is a thicker engine oil than 10W30 at higher temperatures. Both have almost the same characteristics, and the only difference is the oil viscosity.
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Can I mix two different motor 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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Is it OK to mix different viscosity oils?

yes you can mix same brand and type oils with different viscosity and it will be fine as long as you don't mix them 50/50. If you mix 200 ml of oil with the rest of oil needed for your engine you will be totally fine.
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Can I top up engine oil with different viscosity?

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 put 10W40 instead of 10W30?

10W40 has a higher viscosity than 10W30. This means that when you pour 10W40 into your engine, it will have a harder time flowing through the engine and moving around the parts. However, if you use 10W40 instead of 10W30, the oil will stay in place better without leaking out or dispersing throughout your engine.
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Is there a big difference between 10W30 and 10W40?

10W40 oil has a higher viscosity, retaining more thickness than 10W30 as the temperature rises. In that case, 10W-40 motor oil would technically provide better protection against engine wear contact in higher temperatures. Next, let's find out how these multi viscosity oils compare in application and performance.
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What is difference between 10W 30 and 10W-40?

The viscosity of hot oil is measured using different test parameters than when the oil is cold, so the numbers after the “W” don't relate to the numbers in front of the “W”. The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature.
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What happens if you mix two 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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How bad is it to mix oil?

Mixing different types can destabilize your motor oil, reducing its efficiency and affecting your engine's performance. The smartest choice is to stick with the oil type and oil change intervals recommended by your car's manufacturer and visit your local car care experts for affordable services.
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Is it OK to mix synthetic oil weights?

You can mix 'em just fine. While it's true that Synthetic isn't quite like dino-oil (where the base stock is essentially the same and viscosity deltas are mostly a function of additives). Viscosity is formulated into the synthetic, but there's no problem mixing. You can mix Synthetic and Mineral oils too, if you want.
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Is 10W40 good for high mileage?

Designed for high mileage vehicles

Mobil 1 High Mileage 10W-40 motor oil is recommended by ExxonMobil for use in high mileage vehicles (even those that have used lower quality conventional oils), including: Cars. Trucks.
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Is 10W30 good for summer?

As a general rule, you'll get the best protection in the summer when you use a slightly thicker grade of oil, such as a 10W30 instead of a 5W30. Engines need a thicker oil in the summer months because of the summer heat and its effects on thinning the oil out.
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Which engine oil is best for hot weather?

The ideal motor oil for your car is one that can withstand the hottest temperatures in your region while still being able to flow when the weather is at its coldest. SAE 5W30 oil is suited to a broad range of temperatures, making it one of the most commonly used oils on the market.
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What car takes 10W 40?

What Is 10W-40 Oil Used For? You won't likely see 10W-40 as an oil recommendation on a modern-day passenger car. However, it still retains popularity with medium and heavy-duty gasoline engines in light trucks. This oil weight is commonly used in diesel engines or in a smaller motorcycle engine too.
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Is 10W40 fully synthetic?

Semi-synthetic oils such as 10W40 have long been the standard. Their base is refined crude oil, which is then blended with additives.
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Is Thicker oil better for older engines?

A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil - 10W - can help protect worn engine bearings as well.
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Can we use 10W40 instead of 10W30 Scooter?

Yes, engine gets heated up in summer than winter. So, if you use 10w40 instead of 10w30 it's better to your engine. You can use 10W40 if your engine sound is high and have a high vibration. It will not make much damage if you are staying in a hotter climate area.
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Is it OK to put 10W40 in a 5w30?

Your vehicle does not use 5W-30 oil. The recommended oil viscosity for your vehicle, according to Kia documentation, is 10W-40. If you drive the vehicle in exceptionally cold weather, well below 32 degrees, you can use 5W-30 oil but even 10W-40 is still perfectly OK to use if outdoor temperatures are below freezing.
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Which engine oil is thicker?

SAE50 is higher viscosity (thicker) than SAE40, and so on. Straight-weight oils come in a wide range of viscosities. But your car operates (ostensibly) in a wide range of temperatures. When your engine is running at operating temperature, it does not matter too much if it is summer or winter.
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What happens if you mix different brands of motor oil?

Now I should probably mention at this point that mixing different (compatible) motor oils will not "blow-up" your engine – in all likelihood, your engine won't even know the difference and will continue to run just fine. However, it may lead to a degradation of lubricant performance and longevity.
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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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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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