How to Read Oil Weight




To read oil weight, first identify the oil’s grade on the American Petroleum Institute (API) scale. The lower the number, the heavier the oil. For example, Grade 30 oil is much heavier than Grade 10 oil.

Next, find the viscosity index (VI) of the oil. This will be a number between 0 and 100. The higher the VI, the lighter the oil.

For example, a VI of 80 means that the oil is very light, while a VI of 20 means that it is very heavy.

  • Look for the oil weight on the product label
  • Compare the oil weight to the recommended oil weight for your vehicle
  • If the oil is too heavy, it may cause engine damage
  • If the oil is too light, it may not provide adequate protection for your engine

Is 5W30 Thicker Than 10W30?

The oil thickness of 5w30 is 9.3mm2/s while the oil thickness of 10W30 is 11.5 mm2/s. This means that 5w30 is thicker than 10W30. The main reason for this difference is because 5w30 has a higher viscosity index than 10W30.

Is 10W 40 Heavier Than 10W30?

Yes, 10W40 is heavier than 10W30. The first number in the viscosity rating (10W) refers to the oil’s flow at 0 degrees Celsius, and the second number (40) indicates its flow at 100 degrees Celsius. So a 10W40 oil is thicker than a 10W30 oil at high temperatures.

Which is Thicker 30 Or 40 Weight Oil?

The answer to this question depends on a few factors, including the specific gravity of the oil and the temperature at which it is being measured. Generally speaking, however, 30 weight oil is thicker than 40 weight oil. This is because 30 weight oil has a higher viscosity, meaning it is more resistant to flow than 40 weight oil.

The thickness of an oil also changes with temperature; as temperatures increase, oils tend to thin out. So at higher temperatures, 30 weight oil may not be as thick as 40 weight oil.

Is 5W-30 Thicker Than 5W 20?

The answer is yes, 5W-30 oil is thicker than 5W-20 oil. This is because the 30 in the 5W-30 stands for the viscosity of the oil, which means that it is thicker than the 20 in the 5W-20. The W stands for winter, so these oils are designed to be used in colder temperatures.

Engine Oil Codes Explained, SAE (Society of Automotive Engineers) numbers – Oil Viscosity Explained

Weight of Engine Oil

Motor oil is made up of a base oil and additives. The base oil is usually a petroleum product or synthetic oil while the additives can be anything from detergents to corrosion inhibitors. All these ingredients are mixed together in order to create the motor oil that will keep your engine running smoothly.

The weight of motor oil is important because it determines how well the oil will flow and how thick it will be. The thickness of the oil has an effect on how much heat it can dissipate and also how well it can lubricate moving parts. It’s important to choose the right weight of motor oil for your car based on the manufacturer’s recommendations.

Generally, there are three main types of motor oils: conventional, synthetic, and biodiesel. Conventional motor oils are made from crude petroleum and they’re the most common type of motor oil used in cars today. Synthetic motor oils are man-made and they often offer better performance than conventional oils.

What Weight Oil Should I Use

As fall and winter approach, many people begin to think about what weight oil they should use in their vehicles. The weight of oil is measured by its viscosity, which is how well it flows. Cold weather can thicken oil and make it harder for your engine to turn over, so using a lighter weight oil in cold weather can help prevent engine damage.

There are two main types of motor oil: synthetic and conventional. Synthetic oils are designed to withstand higher temperatures and protect against wear better than conventional oils. They also flow more easily in cold weather, so they can be a good choice for winter driving.

However, synthetic oils are more expensive than conventional oils. If you’re not sure what type of oil to use in your vehicle, consult your owner’s manual or ask a mechanic. They can help you determine the best type of oil for your car based on its make, model, and year.

Oil Weight for Winter

As the weather starts to cool down and winter approaches, many people begin to switch their motor oil to a heavier weight. But what does this mean? And is it really necessary?

Let’s take a look at oil weight for winter and whether or not it’s something you need to be concerned about. Oil Weight Basics First, let’s review some basics about oil weights.

Motor oil is classified by its thickness, or viscosity. This simply refers to how thick the oil is – thicker oils are more viscous, while thinner oils are less viscous. The thickness of motor oil is important because it affects how well the oil can lubricate your engine parts.

Thicker oils provide better protection against wear and tear, but they can also make your engine work harder due to the increased friction. Thinner oils don’t protect as well but allow your engine to run more efficiently. So why would you want to use a thicker oil in winter?

The main reason has to do with temperature – specifically, cold temperatures. When motor oil gets cold, it becomes thicker and doesn’t flow as easily. This can create problems because if the oil isn’t flowing easily, it won’t lubricate your engine parts as well and could lead to premature wear or even damage.

By switching to a heavier weight oil in winter, you’re helping ensure that your engine stays properly lubricated even in colder temperatures. Do You Need To Switch? Now that we know all about oil weights and why using a heavier weight in winter can be beneficial, you might be wondering if you actually need to make the switch.

After all, most modern cars are designed to run on lighter weight oils year-round without any issues. So unless you live in an extremely cold climate or do a lot of driving in very cold weather, chances are you don’t need to worry about switching your motor oil for wintertime use. However, if you do find yourself driving in sub-freezing temperatures regularly, making the switch to a heavier weight could help extend the life of your engine by keeping it properly lubricated even when conditions are less than ideal.

Oil Weight Numbers

If you’ve ever shopped for motor oil, you’ve probably noticed that there are a lot of different “weights” or “grades” to choose from. But what do these numbers mean? And which one is right for your car?

Here’s a quick guide to understanding oil weight numbers: The first number (e.g. 5W, 10W, etc.) is the “cold weather” grade. This indicates how well the oil will flow at low temperatures.

The lower the number, the better it will perform in cold weather. For example, 5W oil is designed for use in very cold climates, while 10W oil is more suitable for moderate climates. The second number (e.g. 30, 40, 50) is the “high temperature” grade.

This indicates how well the oil will hold up under high temperatures and heavy use. The higher the number, the better it will perform in hot conditions. For example, 50 oil is designed for use in high-performance engines that run at extremely high temperatures.

So which one should you choose? It depends on your climate and driving habits. If you live in a cold climate and do a lot of short trips (which don’t give the engine a chance to warm up), you’ll want to choose a lower cold weather grade like 5W or 10W .

If you live in a hot climate or do mostly highway driving (which puts less stress on the engine), you can choose a higher temperature grade like 40 or 50 .


A lot of people think that oil weight is something confusing and difficult to understand. However, it’s actually pretty simple once you know the basics. The first thing you need to know is that there are two different types of oil weights: light and heavy.

Light oil weights are typically used in warmer climates, while heavy oil weights are better for colder climates. The next thing you need to understand is how to read the numbers on an oil weight bottle. The first number is the viscosity, which is a measure of how thick or thin the oil is.

The second number is the pour point, which tells you at what temperature the oil will start to thicken up and become unusable. Now that you know the basics of oil weight, it’s time to learn about some of the more specific numbers on an oil weight bottle. The first number after the viscosity is called the API gravity.

This number tells you how much heavier or lighter than water the oil is. A higher API gravity means that the oil is lighter, while a lower API gravity means that the oil is heavier. The next number after the API gravity is called the Specific Gravity (SG).

This number tells you how much denser than water the oil is. A higher SG means that the oil is denser, while a lower SG means that it’s less dense.

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