5W30 vs 10W30 motor oil

Each automobile owner must know that choice of the proper motor oil is the guarantee of durable and efficient engine work. Not all kinds of engine oils are appropriate for all vehicles.

Moreover, the wrongly-chosen oil may even affect engine’s normal operation. If you are a car enthusiast, who have got accustomed to doing everything with your own hands, it’s crucial for you to be aware of what motor oil suits your engine the most. And now, we are going to make your life easier and provide you with the basic comparison of 5w-30 and 10w-30 oils, which are among the most widespread ones.

Key Things to Know about Viscosity

Viscosity is the thickness of the liquid. Motor oil maintains its viscosity at distinct temperatures and is estimated at 210F as it is the motor’s regular operating temperature.

Letter “W” stands for winter. Though, some people may think that it signifies weight. Actually, the higher the number in W, the worse and less efficient motor oil is for winter weather and conversely.

what is viscosity

A simulation of substances with different viscosities via Synapticrelay CC BY-SA 4.0

5w30 and 10w30

Actually, 5w30 and 10w30 are the most prevalent motor oils at the moment. Let’s have a closer look at their peculiarities and, of course, distinctions.

Features of 5w30  

5w30 is a thin variety of motor oil, which is the most suitable for engines, working in winter or regions with cool weather. And the number “5” signifies that as it stands for the lowest viscosity index.

Oil, keeping such a rating, runs smoothly even if the temperature is extremely low. Simultaneously, number “30” stands for the oil’s thickness at high temperatures. Thus, 5w30 is the perfect option if you seek for the oil, which will allow your motor function properly at low temperatures and in winter season.

Furthermore, though 10w30 is more suitable for warm climates and summer weather, you are free to apply 5w30 as well. Basically, 5w30 is the best option for northern America’s states as well as Canada as winters can be very cold in these regions.

Peculiarities of 10w30

10w30, a high-mileage sort of motor oil, keeps the viscosity index of 10 and is the most appropriate option for warm and even high temperatures, serving great for hot summers. 10w30 runs smoothly at high temperatures due to its higher viscosity level.

To be exact, admixtures, known as “viscosity improvers”, are applied to spread and contrast it. Thickness of 30 provides complete protection of the motor during temperature rises or falls. So, 10w30 is a great variant for driving in hot or even desert regions, including California and Nevada.



Manufacturer’s Prescriptions

Along with selecting motor oil depending on the climate you drive in, it’s even more crucial to follow the guidance of your vehicle’s manufacturer. Engineers of each car brand determine what weight of motor oil is the most appropriate for a certain automobile.

By following their guidance, you will guarantee the best possible protection for you motor along with maximal fuel economy.

By applying 10w30 motor oil for engines, designed for 5w30, you may cause excessive temperatures plus increased resistance. By doing vice versa, you may induce oil’s flying off and scattering among the motor’s internal parts while driving. Consequently, engine’s lifespan will be shortened.

As a rule, automotive companies indicate what oils are compatible with their motors and you are free to choose among the recommended ones.

5w30 vs 10w30: What’s Better?

Actually, both motor oils are excellent. So, you just need to be aware of what oil works better in a specific ambience.

5w30 is suitable for each season and able to provide maximal protection at low winter as well as high summer temperatures. Furthermore, it provides decent level of fuel economy as it produces less drag on motor’s moving details plus bearings.

But, 10w30 keeps greater thickness, offering enhanced sealing abilities for older motors as their clearances extend and demand less liquid oil for more efficient protection.

In any case, prior to opting for any type of oil, first read you motor’s manual and discover what oil the manufacturer prescribes for it.



To Sum It Up

So, 5w30 motor oil works great no matter how high or low the temperature is. It gives astonishing fuel economy by inducing less drag on bearing and moving motor details.

Being thicker, 10w30 ensures more efficient sealing ability for aged motors and protects their widened clearance better.

And don’t forget to consult the manufacturer’s manual first!

Written by Dan Hoffman

Dan Hoffman

Dan is a co-founder of Engineswork. He knows everything about internal combustion engines. Ask your questions in comments down below this article – he will be glad to help you anytime.

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