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.

Is it OK to use 10W40 instead of 10W30?

The short answer is yes. Because both oils are formulated to give the same performance, it will be safe for you to use either oil. Some differences between the two oils include viscosity and base oil.

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.

Which engine oil is thicker?

In order to have a standard way to measure the viscosity of engine oil, the Society of Automotive Engineers (SAE) developed a viscosity scale. The scale ranges from 0W, which is the thinnest type of oil, to a rating of 60, which is the thickest oil.

Should older cars use thicker oil?

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.

What does 10w30 mean? 'Engine Oil Explained'

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.

What is 10W-40 oil used for?

Higher viscosity oil such as a 10W-40 can be useful for older engines burning or leaking oil. We offer Mobil™ 10W-40 high viscosity motor oils for use in vehicles with more than 75,000 miles, and a synthetic blend oil when cost is a consideration.

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.

When should I use 10W30 oil?

It is best suited for private vehicles and light-duty diesel and petrol engines, while 10w30 is more suitable for commercial vehicles and other cars with heavy load engines.

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.

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.

Is 10W30 fully synthetic?

Fully synthetic motor oil – The next oil generation for engine cleanliness. Today's vehicles need a motor oil that keeps pace with their changing demands and does more to improve performance and engine life.

What does 10W 30 stand for?

For Example: 10W30

This means the viscosity is at 10W when the engine is cold and 30 when the engine is hot. Low viscosities are good for cold temperatures (hence the “W” association) because the oil is thinner. Thinner motor oil flows more easily and moves quickly.

What is the best oil to use in a high mileage car?

Best Synthetic High Mileage Oil: Mobil 1 High Mileage Full Synthetic. Best Synthetic Blend: Valvoline High Mileage With MaxLife Technology. Best Conventional High Mileage Oil: Pennzoil High Mileage. Best Value: Castrol Edge High Mileage.

What does 10W40 stand for?

10W-40 is the viscosity, or weight, of the motor oil as defined by the Society of Automotive Engineers (SAE for short). A 10W-40 oil has a viscosity grade of 10W at a low temperature and 40 at a higher temperature. What does this mean, exactly? Motor oil thickens when it's cold and becomes thinner when heated up.

Is 5w30 or 10w30 better for high mileage cars?

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.

Is 10W-40 oil OK for petrol engine?

Redex 10W-40 Part Synthetic Oil is a high-quality engine oil suitable for both petrol and diesel vehicles, including those with fuel-injected, multi-valved and turbo-charged engines.

Is 10W-40 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.

Can I use 10/40 oil in my car?

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.

How long does 10W40 oil last?

Unopened Motor Oil

This will give you about 2-5 years before unused oil becomes unfit for consumption. Unless you need to use the oil, do not open the oil bottle at all. Keep in mind, though, fresh oil will degrade over time and lose its oil additives properties, impacting the oil life.

What happens if you put too thick oil in a car?

If the oil is too thick (aka, the viscosity is high), your car may not start in cold temperatures (cold weather places more strain on a vehicle in any case). When this happens, the thick liquid can't properly lubricate every part, and it creates enough resistance to impair the most important function–ignition.

Will heavier oil hurt my engine?

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.

When should I add thicker oil to my car?

There are some circumstances where drivers have used thicker oil in an engine. If, for instance, clearances between engine components have increased, gotten sloppy, a thicker oil can help to fill the void. Within reason, thicker oil maintains a better lubricant film between moving parts.

Will synthetic oil raise oil pressure?

The synthetic oil cleans the dirt accumulated in an old engine, which increases the oil flow, decreases the pressure and increases the amount of oil that reaches the combustion chamber, increasing the consumption of lubricant.