Can you mix 5w 30 and 10w 30 oil?

Asked By: Yongmin Orrico | Last Updated: 22nd May, 2020
Category: business and finance gasoline prices
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Yes, if topping up. If your oil must be topped up, then you are burning oil already, so the difference won't cause more damage than is already there. 5W30 and 10W30 are essentially the same at operating temperature. What is the difference between engine oils 0w-30, 5w-30, 10w-30?

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Also to know is, can you mix 5w30 and 10w30 oil?

Keep in mind oils do not mix if you have 5w30 and add 10w30 it won't give you a blens both oils will stay seperate so you will have a few quarts 5w30 and a quart 10w30 they never mix.

Similarly, can you mix different weights of motor oil? Mixing different oils will not improve the performance or efficiency of the engine in any way. The additives in synthetic oil may have limited or no effect at all when mixed with a regular engine oil. Now, as far as different grades are concerned, mixing between them isn't something that will damage your engine either.

One may also ask, can you substitute 10w 30 for 5w30?

Yes. 5w30 and 10w30 are both 30 weight oils and the exact same thickness in your engine when it is at operating temperature. The 5w30 is better because it thickens less when cool or cold. Thinner oil gets to the top end faster.

Which oil is better 5w30 or 10w30?

5w30 is less viscous than 10w30. 5w30 is also the thinner engine oil of the two at lower temperatures. 5w30 is used for light-duty engines while 10w30 is used for engines which carry heavier loads. 10w30 provides sealing action in the engine due to the fact that it is thicker than 5w30 engine oil.

39 Related Question Answers Found

Can synthetic oil be mixed with conventional oil?

The simple answer: Yes. There is no danger mixing synthetic and conventional motor oil; however, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits. So, yes, you can safely mix synthetic and conventional oil.

Can you mix 5w30 and 5w20 oil?

No harm; if that's all you can get, go for it. From the factory, Lexus calls for 5W30 for all years of IS350 and 2006-2010 IS250, 0W20 for 2011-13 IS250. I would not recommend mixing weights. While there is a minimal viscosity difference between 5W20 and 5W30, there is a difference.

Can you mix different viscosities of oil?

Different viscosities of the same brand oil will have different amounts of viscosity index improvers (polymers), but otherwise the additive systems will be the same. It is always advisable to not mix motor oil brands, however, different viscosity grades of the same brand motor oil are compatible.

Can I mix high mileage oil with regular oil?

According to Mobil Oil, it should be fine to mix oils. So, if you are low on oil, don't be afraid to add a quart or two of synthetic oil if you are using regular oil or even regular oil if you are using a synthetic.

Can you just put more oil in your car?

You can always add oil to your engine to return the oil to it's correct volume as indicated on the oil dip stick. Make sure you are checking the oil level with the engine cool, and wipe off the oil on the dip stick before returning it to the engine, completely seating it, and then pull it out to take a reading.

Is it OK to mix different synthetic oils?

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.

Can I mix SAE 30 with 5w30?

You are correct that adding 1qt SAE 30 to 3qt SAE 5w-30 will increase viscosity of the 5w-30 at ALL temps.

Is it bad to mix old and new oil?

As long as you are using the same weight oil, it will mix up and you'd never know it. Continue to change your oil at the specified interval and you should be golden. Usually when changing the oil you won't be able to fully drain the old oil anyways and the old and new oils will mix, like it or not.

Should you use thicker oil in an older engine?

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.

Will switching to synthetic oil cause leaks?

Switching to synthetic oil causes leaks: Generally, switching to synthetic oil does not cause leaks. It is true that synthetic oil is thinner than conventional oil and therefore flows more easily. If there is a spot where oil could leak out in your engine, then synthetic oil is more likely to leak than conventional.

Can I switch from 5w30 to 10w30?

When to Use 10w30 vs 5w30
The only difference between these two oils is cold flow ability: a 10w30 oil will move slower than a 5w30 oil during cold startups. You should always use the weight of oil recommended by your vehicle's manufacturer to provide your engine with the best protection and maximum fuel economy.

What is 10w 30 oil recommended for?

For 10W-30 oil, the 30 is the same as the SAE 30 viscosity rating for warm oil, but the 10W is the viscosity rating for cold oil, according to a standardized rating system developed by the SAE for winter oil use. And that's what the "W" stands for: "winter."

What does the W stand for in oil?

The "w" in motor oil stands for winter. The first number in the oil classification refers to a cold weather viscosity. The lower this number is, the less viscous your oil will be at low temperatures. For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil.

Does thicker oil reduce oil consumption?

Thicker oil makes an engine harder to start in cold weather, reduces oil circulation around the engine and increases oil pressure, which means there will be more pressure trying to push the motor oil past seals and gaskets.

Should I switch to synthetic oil high mileage?

It's not accurate to say that you should never use synthetic oil in an older car. In fact, Castrol EDGE High Mileage is a synthetic oil designed specifically for high-mileage cars. If the car has been maintained and is in excellent running condition, the synthetic oil may protect the vehicle and prolong its life.

Does GM recommend synthetic oil?

Dexos engine oil specification is designed by GM Powertrain engineers and is intended specifically for GM engines. Synthetic oils are recommended by lube technicians in high mileage vehicles and vehicles that run in extreme conditions (i.e., cold weather, hot weather, elevation changes).

What happens if you put the wrong oil in a car?

The brand of motor oil matters little, but its viscosity grade (10W-30, for example) is important. Using the wrong oil can lead to reduced lubrication and shorter engine life. If the manual says to use synthetic oil, do so.