The viscosity of an oil is measured by its resistance to flow. There are two numbers that define viscosity meaning. The first number precedes the letter 'W' which stands for Winter. This measurement is related to how an oil flows when it is cold, such as at engine start-up.

What does the w stand for in 5W30?

5W-30 means that this is a multigrade oil. This is indicated by the two numbers separated by a "W" 5W - shows thickness/viscosity of the oil on a start-up - when you start the car (W - stands for Winter, this indicates oil performance under colder engine temperatures when the engine has not been running)

Does the W stand weight on oil?

“W” stands for “winter.” When oil grades are hyphenated (i.e. 10W-30), this indicates range of viscosity attainable with this particular oil, namely it behaves like 10 weight oil (less viscous) when it is cold or “winter” and thanks to viscosity modifiers (manufacturer added oil additives), it will behave like 30 ...

What does the W stand for in 10W 40 oil?

Oils have a specified maximum viscosity at a cold temperature. The lower the W number is (“W” stands for Winter), the thinner the oil will be. In this case, a 10W rated oil will be thicker in winter than a 5W oil. The 40 rating: The 40 represents the oil's viscosity at hot temperatures.

Is it OK to put 10W40 in a 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.

What does 10w30 mean? 'Engine Oil Explained'

Is 5W 20 the same as 5W 30?

Key difference between 5w20 and 5w30

5w20 is an engine oil type characterized by its winter rating of 5 and an oil weight of 20 in warmer conditions. It is less viscous compared to 5w30. 5w30 has the same viscosity rating of 5 during winter but an oil weight of 30 during hotter conditions hence it is thicker.

What does the W stand for in SAE oil?

SAE viscosity gradings include the following, from low to high viscosity: 0, 5, 10, 15, 20, 25, 30, 40, 50 or 60. The numbers 0, 5, 10, 15 and 25 are suffixed with the letter W, designating they are "winter" (not "weight") or cold-start viscosity, at lower temperature.

What does W stand for on SAE 10W grade?

The short answer:The numbers represent the viscosity of the oil and the W stands for WINTER. The long answer:The Society of Automotive Engineers (SAE) has established a numerical code system for grading motor oils according to their viscosity characteristics.

What does the W stand for on a quart of oil?

The “w” stands for winter and indicates that the lubricant in question has a different viscosity, or different flow characteristics, based on temperature. For example, a 5w30 oil weight rating means that on cold start-up — even at subzero temperatures — the oil flows like a 5 weight oil.

What is thicker oil 5W or 10W?

A 10W or 5W is the index for how easily the oil flows in winter (hence the W). A 10W oil thickens more than a 5W. The other number indicates the oil's resistance to thinning at high temperatures.

What is 30w oil used for?

SAE 30 oil is typically used for smaller air-cooled engines, like the ones in small tractors, lawnmowers, and chain saws. Most motor oils today are multi-grade oils that will perform well in all seasons.

What is 10W 30 oil?

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's the difference between 10W 30 and 10W 40 oil?

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.

What is 10W oil used for?

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.

What is the meaning of 20 W 40?

The first number “20W” indicates the oil viscosity at a cold temperature, while the second number “40” means the oil viscosity at the operating temperature or hot weather. The “W” stands for winter.

Which is better 10w30 or 15W-40?

Because 10W-30 is thinner than 15W-40 oil, its film strength can be weaker and it can be more prone to oxidation. Therefore, high quality additives are needed to compensate for those weaknesses in order for a 10W-30 engine oil to protect as well and last as long as a 15W-40.

What is 20W 50 engine oil?

20W-50 is a common motor oil used in moderate-to-large diesel and gasoline engines, high-performance motorcycle bikes, and aviation vehicles. Its resistance to thinning at high heat also makes it popular as a racing oil and high temperature driving.

What does 75W140 mean?

SAE 75W140 meaning

The value before the "W" (W=winter suitability) indicates the flowability of the oil at cold temperatures. Transmission oils with 75W remain flowable up to -40°C. The number "140" refers to the kinematic viscosity of the transmission oil at 100 °C. This has a range of 24.0 and 32.4 mm²/s.

Can I use 5W 20 instead of 5w30?

Mixing 5W-20 and 5W-30 (or any other oils for that matter) may lead to faster wear and tear of your engine and eventually cause problems with the basic functioning of critical engine parts. And even if your engine allows it, you won't get any noticeable results by mixing different viscosity grade oils.

Is 5W-30 the same as SAE 5w30?

To be clear, SAE 30 and 5w30 are not the same. SAE 30 is a single-grade oil meaning it is only rated one time at a very high temperature. This high-temperature rating is right in the middle at 30. 5w30 on the other hand, is a multi-grade oil that has two ratings.

What if you use the wrong engine oil?

You might notice a few oil spot in your garage or under your car because using the wrong oil can lead to leaks, or you might become aware of a burning smell while driving. If the oil isn't working as it should engine parts might not be lubricated well enough and cause friction, which can burn the oil.

Can you put 10W 30 in a 5W 20?

Notwithstanding the recommendations of the car manufacturer, mixing 10w30 and 5w20 will not cause any sort of harm to the engine. However, a few drivers claim that it is safer to combine two multi-grade or straight weight oils, rather than mixing multi-grade with straight weight oils.

Is it OK to mix synthetic oil with regular oil?

So, can you mix synthetic oil with regular oil? Yes. If it's something you do only occasionally, mixing shouldn't damage your engine.

What happens if you use 10W40 instead of 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.