What does the weight of oil mean?



You might be familiar with terms such as “30-weight” or “10W-30” oil. Those numbers refer to the grade. The higher the number, the thicker the oil. The lower the number, the thinner. Thinner oils flow faster than thicker oils, and engineers design engines to work with a certain grade of oil.

Is 5W-30 oil thicker than 10w30?

Both the oils have similar viscosity at 100 degrees Celsius but 5w30 grade oil will thicken less than 10w30 grade oil in cold climate. This means 5w30 grade oil will flow effectively in low temperatures, whereas 10w30 oil will flow effectively in high temperatures because of the smaller temperature window.

What is heavier 30 or 40 weight oil?

Obviously, a 10W-40 is thicker than a 10W-30 at high temperature. Armed with knowledge of viscosity grades, how can we put it to good use? Remember that using oil with a viscosity that is too high can result in excessive oil temperature and increased drag.

What does heavier oil mean?





Heavy crude oil (or extra heavy crude oil) is highly-viscous oil that cannot easily flow from production wells under normal reservoir conditions. It is referred to as “heavy” because its density or specific gravity is higher than that of light crude oil.

Is Higher oil weight thicker?

The higher the number, the thicker the oil. The lower the number, the thinner the oil. For example, a rating of 5W-30 means that the oil will have a viscosity rating of 30 at 212℉, or 100℃, (an engine’s average operating temperature).

What happens if I use 10W40 instead of 5w30?

As 5W30 is a thin oil, mixing it with 10W40 will give you a much thinner oil. Eventually, it will increase its operational capability in cold weather. But, it will not be good enough in hot weather.

Should I 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 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.

What happens if I use 10w40 instead of 10W30?

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 thicker than 5w30?

Main Differences Between 5w30 and 10w40



The 5w30 oil is much thinner than the 10w40 oil and on the other hand, the 10w40 oil is much thicker than the 5w30 oil. The viscosity of 5w30 at low temperatures is 5 whereas the viscosity of 10w40 at low temperatures is 10.

Is 5W-30 thicker than 5w20?

So, due to viscosity, 5w20 is a thinner oil during operating temperatures, whereas 5w30 is thicker during operating temperatures. A majority of manufacturers are now producing engines that operate on 5w20 oil, to which it’s important to stick to this viscosity and not substitute 5w30.

Is 5w40 thicker than 5W-30?

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.



Can I use 5W 20 instead of 5W-30?

It’s not recommended to use 5w20 instead of 5w30 engine oil because Both come with different viscosity. 5w20 oil is thinner and mostly designed for performing better with newer engines.

Is synthetic oil OK for older engines?

It protects better, performs better, and lasts longer, and it’s no longer made with a chemical compound that could hurt older vehicles.

Does thicker oil increase oil pressure?


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

Does thicker oil burn less?

What Do Motor Oil Weights Mean? (Like 10W-30) | Quick …

What is 40 weight oil used for?

This oil weight is commonly used in diesel engines or in a smaller motorcycle engine too. The 10W-40 oil viscosity also often serves as an alternative for older engines with burning or oil leaking issues. Why is that? The 10W-40 engine oil has a thicker viscosity than, say, 10W-30 oil when the car engine is hot.



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.

What is 30 weight 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 weight 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.

Is 5w30 thicker than 5w40?

5w40 oil is not thicker has it has a higher viscosity. 5w30 has lower viscosity hence it is suitable to use in hot or lower temperatures. 5w40 has higher viscosity hence it is not suitable at all temperatures. 5w30 is a multi-graded oil which is suitable to use in lower temperature.

Is 15w40 thicker than 5w30?

The lower the kinematic viscosity number, the thinner the oil. For example, a 5W-40 oil will be thinner in cold temperatures than a 15W-40, but at normal operating temperatures both oils will flow the same.