Thicker oil is able to better lubricate an engine at higher temperatures, as it has a propensity to stick to components. Even though thinner can often mean decrease running costs, it will also exacerbate excess heat formed by the friction of rubbing components, which could end up causing excessive wear and engine damage. Wear and tear will loosen, machine away, and even chip components within a vehicle. As these components become worn, a thicker option will ensure that larger gaps and worn components will stay lubricated.
Vehicles that are turbocharged, tuned, or otherwise have special components often run at higher operating temperatures than their regular counterparts. That being said, vehicles with loose clearances will require a thicker oil at operating temperature than those with tight clearances. This is similar to the concept of older vehicles having more wear and tear on the engine components than newer vehicles whose components are well-fitted and not yet broken in.
Often, taking your vehicle to anybody but a dealership will result in you choosing the oil you want. If you have an older vehicle, you may need a conventional single grade oil. The differences between 10W and 10W may not be as great as they used to be back when single-grade oil was all that used to be available, but there still are differences. I've had a passion for cars since 8 years old, and been a subscriber to Auto Week magazine since my 10th birthday.
Ever since I turned old enough to drive, I have driven as many vehicles as possible, while teaching myself how to perform maintenance and upgrade work on every vehicle I've owned. For the past 10 years, I've been honing my skills as a vehicle hobbyist, in recent years also enjoying writing car reviews, opinion articles, vehicle how-tos, car-buying guides, and even provide individual consultations for those who need car-buying advice.
In addition to writing for Vehicle Scene, I currently write for Autolist, and also own and operate my own vehicle blog website, The Unlimited Driver. Sign up to receive new articles, tips, tricks, and guides, as well as discounts on top products, hitting your inbox every week! Cleaning Maintenance Tools Accessories Electronics. Shawn Furman Last Updated: June 24, What Does the "10" mean in 10w30 and 10w40? What Does The "W" Represent in 10w30 and 10w40? What Does the second number mean in 10w30 and 10w40?
What is viscosity? How Is Motor oil graded? How To Decide Between 10w30 and 10w40? Changing your oil is a hassle in itself without having to decide what oil to use. This oil performs well under typically heat conditions. This means that the first number represents the viscosity at winter temperatures. This means that 10w30 is less viscous than 10w40 at higher temperatures.
Each number is is given ascending grades from: 0, 5, 10, 15, 20, 25, 30, 40, 50 and Oil with two values are multi-grade oil designed to perform all year — during winter and summer. If you have an older car that is high in mileage, you typically recommend using thicker oil.
The thicker oil will reduce wear and tear and extend the life of your engine. The manual will typically give you the recommended oil that you can use on your car. Use the option that is recommended in the manual. If the oil is too thin inside your engine, there will be excess friction inside the engine.
This excess friction will increase the wear and tear on the engine. If the oil is too thick, then the engine will need to work hard to get the engine started. This extra work will increase the wear and tear on the engine. This is why you must use the correct oil when choosing your motor oil. The fuel efficiency difference between 10w30 and 10w40 is marginal. In theory, the thinner 10w30 is more fuel-efficient than 10w Choosing motor oil for your situation will result in the highest performance of your vehicle.
This means that they perform the same in cold weather. The main difference between 10w30 and 10w40 is their hot weather performance. The operating temperature of 10w30 is more common than the operating temperature of 10w The increased viscosity of 10w40 is better for higher temperatures.
However, it can be a cause of concern when the engine heats up. The viscosity of a liquid continually changes because the oil runs through the engine. As discussed, motor oil adjusts with the changes in temperature. Due to the increased motion of the molecules, the oil becomes less viscous when it heats up.
Therefore, it is imperative to keep it in mind when purchasing categorizing oil. In order to keep the car engine functioning well, it is necessary to know about the change in viscosity.
The thin oil is perfect when the engine is cold. However, the same is not ideal when the engine is hot. Therefore, finding multi-weight oil is the surefire way to be assured that oil will not thin out too much when the engine works.
As temperature changes, the long-chain polymers present in oils expand and contract accordingly. They alter the way the oil behaves. Since they are designed as per the needs, they are thin when cold, and not thin at high temperatures.
The number before the W tells that the oil weighs in cold condition. During the weight measurement of multi-weight oil, having an understanding of the numbers will help immensely. The second number shows the temperature of more than degrees centigrade.
Multi-weight oils are a preferred choice in the automobile industry because they are thinner when hot as compared to when cold. Both 10W30 and 10W40 oils move through the engine quickly. The oil becomes viscous when the temperature is cold. So, it means that the engine oil rated OW20 will circulate more quickly throughout the engine as compared to oil with 10W ratings.
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