Changing motor oil

Oil viscosity or the oil’s thickness is essential as it helps to determine the film strength of the lubricant. It also keeps a check on its efficiency to reduce the friction between the parts in motion. The viscosity of thin oil is low, while that of thick oil is high. This post will give you a detailed explanation of oil viscosity to choose the best motor oil.

During operation, thicker engine oil makes the machine work harder. So, it generates more heat by utilising more energy. With time, it tends to cause unnecessary wear and tear within the machine. In contrast, if the lubricant is thin, its film won’t be thick enough to prevent friction. Even this would cause the same amount of wear and tear. 

You’ll find the motor oils that best suit your vehicle’s needs in various India car accessories online stores. So, using the same type of oil throughout can be good for your car’s health.

Oil Viscosity Explained

Oil’s viscosity stands for its resistance to flow and shear. This property is affected by several factors, including:

  1. Water contamination
  2. Particle contamination
  3. Contamination of the water level of the other car fluids
  4. How old the engine oil
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Dynamic Vs. Kinematic Viscosity of Oil

Mainly there are two varieties of oil viscosity: dynamic viscosity and kinematic viscosity. The kinematic oil viscosity indicates the flow rate of the lubricant due to the force applied within the engine. The dynamic viscosity of oil refers to the force necessary for the proper flow of the lubricant. 

The units used for measuring kinematic and dynamic oil viscosity are as follows:

  1. Dynamic viscosity: mPa·s or millipascal seconds
  2. Kinematic viscosity: mm²/s or square millimetre per second

Viscosity And Viscosity Index – What’s The Difference?

The internal frictional forces that prevent liquid flow refers to as viscosity. In other terms, viscosity calculates how thick a liquid is. On the other hand, the viscosity index measures how much viscosity changes with temperature. In general, the viscosity reduces as temperature rises and vice versa. 

It has a high viscosity index when the viscosity change brought on by the temperature difference is minimal. The capacity of oil to provide better starting at low temperatures and preserve the oil film well at high temperatures increases with an oil’s viscosity index. As a result, the viscosity index is one of the key factors in judging the quality of engine oil.

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How Does Viscosity Affect Your Engine?

When thinking about engine protection, oil viscosity is the most crucial factor. Your engine’s lubricant’s viscosity influences how it will respond to variations in speed, pressure, and temperature.

For instance, getting your automobile to start in the morning during the chilly winter could be challenging. This is because lubricants thicken in colder temperatures and need more energy to circulate, owing to decreased flow. As a result, your crankshaft must push through heavy oil to spin quickly enough for your automobile to start. 

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Your engine’s components can become worn out as a result of this. But when the temperature rises, the oil gets thinner and is simpler to move around. The latest engine oils come in various ranges that can easily accommodate most car engines.

What Will Happen When You Use the Engine Oil of Wrong Viscosity?

You may encounter a number of issues depending on whether your oil’s viscosity is too high or too low. This may include poor fuel efficiency, higher engine wear, and greater chemical breakdown.

Is It Possible to Mix Engine Oils of Different Viscosities?

Yes, you may combine various engine oil viscosities, but there are a few things to take into account before doing so. You can mix almost all engine oils, whether mineral, completely synthetic, or semi-synthetic. There won’t be any adverse effects like chemical reactions in the crankcase, bubbling, or foaming. However, this is not the case for other varieties of engine oil.

In emergency situations, you can add the only available option of oil you have with you. However, how the engine operates after that relies on how much oil you already have in it and how much you add.

Take the two most popular engine oils, 5W30 and 5W40, as an example. Since their oil viscosity is so near, mixing the two types of oil and even driving until the following change is possible. This is more favourable if the manufacturer and their class are the same. You can also mix dynamic viscosity with almost similar values of 5W-40 and 10W-40.

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You will thus obtain an average number based on the ratios of the two components. For long-term operation, mixing viscosity values that are comparable but come from different classes is also permitted.

The one combination that is not ideal is mineral oil and synthetic oil. If there is no other choice, only combine these oils; if you do, replace your engine oil as soon as you arrive at the closest shop.

You can blend various viscosities of oil as long as they come from the same manufacturer, preferably one with a good reputation, provided the oils meet API and ACEA criteria for viscosity and quality.

So, this is all you had to know about oil viscosity. To purchase the best quality motor oil for your engine, visit They are among the best-selling store of engine oils and lubricants at a great deal.

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