Can I add 10w40 to 5w30?

You can, but you will have a viscosity between the two viscosities. What it is, depends on how much one oil is mixed with the other oil. Putting a quart of 10W-40 in an engine with 5W30 should be ok.

Is 10W40 OK for 5W-30?

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.

Can you put 10W 30 oil in a 5W-30 engine?

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.

Can you mix 30 and 40 weight oil?

You can use 1 litre of 5W30 mixed with 5W40 and it will not cause any sort of ill effects to the engine. Having said that, it is always better to stick to one grade of oil till the time you decide to completely drain your car and top it up.

Can you 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.

Does thicker oil increase oil pressure?

Quote from video: And that is going to increase your oil pressure your psi or kPa will increase.

What is the next thicker oil than 5W-30?

To put this in another way, once your engine heats up and is running, both 10W30 and 5W30 are of the same viscosity. However, 10W30 is thicker and more viscous than 5W30 in colder weather or at lower temperatures, such as when you’re cold starting your car.

Is it OK to mix engine oil?

No – you shouldn’t mix engine oils with different specifications like this. These two oils have contrasting viscosities and are designed for completely different types of use.

Is it OK to mix different grades of engine oil?

It is always advisable to not mix motor oil brands, however, different viscosity grades of the same brand motor oil are compatible. Be aware that mixing viscosity grades will turn out a product that is different in viscosity than either what was originally in the engine or what was added.”

Is it bad to mix different kinds of oil?


Even if two different brands of oil have the same viscosity, you still should not be mixing them together.

Should you put 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.

Can thicker oil damage oil pump?

No sense wasting good 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.

Will thicker oil damage my engine?

Using oil that is thicker than recommended may lead to a decrease in fuel economy, a higher load on your engine, and even a shorter life for your engine. Conversely, using thinner, lighter-weight oil than recommended can cause excessive wear and shorter life.

Can you mix oils of the same weight?

You can indeed use the same oil weight already in the vehicle, but mixing weights just isn’t recommended.

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.

Can I mix different weights of synthetic oil?

Viscosity is formulated into the synthetic, but there’s no problem mixing. You can mix Synthetic and Mineral oils too, if you want.

Can I mix 5w30 and 5w40?

Conclusion. So, can you mix 5W30 and 5W40 oil? Just like mixing full synthetic with semi-synthetic oil – mixing different viscosity such as the 5w30 and 5w40 is not a bad idea, especially if you are running low on oil. However, doing so is not ideal if you want to reap the benefits of what the motor oil brand intends.

Which is thicker oil 5W-30 or 5w40?

Although both have the same viscosity grade in cold weather, 5W-40 is thicker than 5W-30 at warmer temperatures. It’s also worth pointing out that: 5W-40 is the suggested oil for most diesel applications. Rarely (if ever) do vehicle manufacturers recommend putting 5W-40 oil in a gas-powered engine.

Which is heavier 5W-30 or 5w40?

Thickness of 5w30 and 5w40

5W30 is lighter, so it got better fuel consumption.