Will 10w40 hurt a 5w20 engine?

And a 10W40 would invalidate your warranty… just so you know. In a 5W20 engine. You could use a 0W20 oil (I use 0W20 oil) in cold weather and it would be Ok by Ford. (they will not say it is good, but they will still honor the warranty..)

Can you mix 10w40 with 5w20?

You can mix 10W & 30W to get 20W or you can mix 5W20 & 10W40, but you do not want to mix 10w & 10W30. In other words, it’s OK to mix straight weights or multigrades but not straight weights & multigrades. Eeeep…. I accidently mixed 10w40 with straight SAE40 oil in my caddy before…

What happens if I put 10w40 instead of 5w30?

If you use 10-w-40 instead of 5-w-30 specified by the manufacturer then the viscosity of 10-w-40 used by you will be higher and oil thicker than what is specified during winters. Similarly the oil viscosity will be higher and oil thicker than specified during summers.

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Can you put 10W 40 in a 5W 30 engine?

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.

Will using 10W 40 an on engine that is asking for 5W 30 negatively affect my engine if yes in what ways?

Using a lower hot oil weight specification, such as 30 instead of 40 will result in less energy lost due to the oil pump having less resistance to pumping and also more viscous oil may make the engine have overall more mechanical losses while rotating.

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.

Is mixing 5w30 with 5W20 bad?

Can you mix 5w30 and 5w20 oil? While we would keep emphasizing that mixing of motor oils is not advisable, we cannot oppose the fact that it is actually safe to mix different oils, especially when it’s from the same brand. … Well, 5W30 and 5W20 will deliver the same performance and flow evenly at low temperatures.

Should I use thicker oil in a high-mileage engine?

High-mileage motor oil doesn’t hurt and it could prevent leaks from starting. … Some mechanics recommend switching to a thicker (higher viscosity) oil — such as 10W-30 full synthetic oil instead of 5W-20 full synthetic — or using oil additives to stop leaks.

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Which oil is thicker 5w30 or 10w40?

A 10w-40 motor oil is a thicker oil at startup than a 5w-30 motor oil. Therefore, 10w-40 oil clings to the engine’s moving parts more than the lower viscosity 5w-30 oil.

What happens if you put thicker oil in your car?

If you use too thick of a motor oil for the conditions, your fuel mileage will likely suffer. This is because the thicker oil increases resistance on moving parts such as pistons. While your engine will be protected, it will be at the expense of more frequent trips to the gas station.

Is Thicker oil better for older engines?

Newer vehicles can utilize thinner oils for faster lubrication of new engine parts. In contrast, older, high-mileage engines benefit from thicker oils to prevent friction and oil loss.

When should I use 10w40 oil?

Ambient Temperature

This is the reason your location is so important in selecting which oil to use. Between a 10W-30 and 10W-40, 10W30 motor oil would run smoother in colder climates while a 10W40 would be more effective in preventing engine wear and tear in warmer temperatures.

Is 10w40 better than 5w30?

The difference is in the viscosity of each at different temperatures. … 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.

Will 10W 30 oil hurt a 5w30 engine?

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. 5w30 and 10w30 engine oils have close viscosity, and thus there is no harm in mixing them.

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What happens if you put 10W oil in 5W?

In winter the 5W will flow like a 5W oil and a 10W will flow like a 10W oil just until the engine reaches operating temperature. This multi-grade performance allows faster oil flow during cold start, however when the oil warms up, they both reach the designated 30 weight viscosity.

Is it bad to add oil without changing it?

So, again, let’s say you keep adding oil to your engine – but you never replace it. … So if your oil filter isn’t changed, your oil gets filthier. And the dirtier your oil, and the thicker and more sludge like it becomes, the less it can lubricate the metal parts of the engine that are pressing together.

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