5w40 oil meaning. it has good flow properties at cold and warm .

5w40 oil meaning Combining low-temperature fluidity and high-temperature viscosity, it provides excellent protection and lubrication. Apr 11, 2025 · So, what does 5W-50 engine oil mean? In this comprehensive guide, we’ll delve into the world of engine oil viscosity, explore the significance of the 5W-50 designation, and provide a detailed breakdown of its benefits and applications. 5W40 can be used for higher mileage engines and warmer temperatures. That's why it's better to see your owner's manual before choosing oil. So you can use 5w30 motor oil for your engine because it is recommended and suitable. But can we use synthetic 5w40 oil for high performance vehicles like Formula 1 racing cars? The higher the second number is, the thicker the oil is at that defined temperature condition. The 5W-40 will exhibit better performance in high operating temperatures and high-performance conditions, up to 50 degrees C (122 degrees F). Rotella T 50 is also a bit more expensive than Rotella T 15W-40. This indicates that the oil has a low viscosity at low temperatures, allowing it to flow easily when the engine starts. On the plus side: Oct 30, 2025 · 5w40 oil forms a robust oil film that improves sealing ability and is suitable for the heavy loads commonly found in high-performance vehicles. What is the difference between 0w20 vs. This affects how effectively the oil lubricates and protects the engine. 5w40 vs. They perform better at extreme temperatures and typically contain additives that enhance engine health and operation. Synthetic engine oils are a to-go option for many due to their attributes like cleanliness and consistency, making them efficient lubricants. About 0w20 and 5w40 engine oils We can’t fully understand these motor oils unless we discuss what the number and letters mean. You can use a 5W50 motor oil in classic or collector cars and high operating temperatures. What does 5W-40 mean? “W” stands for winter. This type of oil has a viscosity grade of 5 at low temperatures and 40 at high temperatures, making it suitable for a wide range of driving conditions and engine types. Older engines were built with much looser tolerances, which allowed oils such as 10W30 to be commonplace as an OE recommended oil in the 1990’s and before Motor oil viscosity grades The word viscosity describes how easily an engine oil flows. The Jun 1, 2022 · Detailed deciphering of all markings on engine oil cans. Aug 25, 2025 · Buying and replacing the oil in your car is going to be your most common form of maintenance, but you'll need to understand what the W on the bottle means. Whether for gasoline or Mar 20, 2017 · Is 5w40 considered a 5wt oil or is it considered a 40wt oil? I understand that as the oil heats up it slowly goes down in numbers to about a 5 wt viscosity. Read on. . This leaves them still wondering what the viscosity numbers really mean on a bottle of motor oil. The “40” shows that this oil is a bit thicker than the average motor oil, which is usually 30 for most cars, and it oils the engine more than average while it is hot. Click now! Discover the ultimate Engine Oil Specification Chart to choose the right oil for your vehicle. So, if you’re looking for the best possible Apr 1, 2020 · Luckily for you, each oil type uses slightly different numeric characters for easy identification. The 5w40 engine oil is a versatile oil thanks to its operability across a wider temperature range. Meaning that the first numerical Sep 29, 2022 · For example, 5W-40 is a grade that is only found in fully synthetic oil, b For example, 5W-40 is a grade that is only found in fully synthetic oil, b Also, most diesel engines use 15W-40, while most gasoline engines use 5W-40. However, it’s crucial to choose the right oil for your specific needs, considering factors such as climate conditions, engine type, and driving habits. A higher oil viscosity number indicates a thicker oil. You wouldn’t believe it but, in the oil grading of engine oil, the little value speaks all the characteristics by itself. The number “40” implies that it differentiates from the most common motor oil (30) among the cars, as it is denser, and this ensures more profound engine lubrication during hot temperatures. Jun 18, 2022 · What is 5w40 vs 10w30 motor oil? What are their purpose as well as differences? which one will be better for your use? If you are asking all these, are in luck! Nov 17, 2023 · What Is 5W40 Engine Oil? 5W40 engine oil is a multi-viscosity option, formulated to offer solid performance in varying temperatures. It provides exceptional cleaning power, wear protection and overall performance. Three of their prominent products in this category are the AMSOIL European FS, MS, and LS motor oils. The number before the “W” signifies the viscosity of an oil at low temperatures and the number following the “W” indicates its viscosity at Aug 1, 2023 · 5W-40 is thin motor oil, meaning, it will easily get to a vehicle’s moving parts and lubricate while trying to start it up. As a car driver, you have to know the differences between these two. The engine hums to life, but have you ever wondered what helps it perform smoothly in extreme temperatures? Motor oil plays a vital role, and its viscosity rating—like 5W and 10W—can make all the difference. For cold startups, the first number is the oil viscosity measurement. The 5w40 motor oil and 5w50 motor oil are not included in the recommended list. 5W30 is suitable for operating temperature between -25°C and 25°C, and 5W40 has a range of between -25°C and 35°C. Nov 12, 2025 · Most oils that meet LL-01 are built around robust 5W-30 or 5W-40 formulations with high-temperature protection. Viscosity The viscosity of 5w40 motor oil has a viscosity index of one Discover the complete Engine Oil Classification Chart with SAE, API, ACEA, ILSAC, and JASO standards to choose the best oil for your vehicle. When the engine is running and hot, 5W-40 and 10w40 have high viscosities and are equally effective in protecting against engine wear What does 5W-40 actually mean? The “W” stands for “ winter,” the number preceding it indicates the oil’s viscosity (or thickness) at low temperatures (hence the W), and the number after it indicates viscosity at higher temperatures (150oC on average), when the engine is actually running. But here’s the catch – it might take a little bit of a toll on your fuel efficiency. Dec 17, 2023 · 5w30 and 5w40 are designations for motor oils that inform users about the oil's viscosity characteristics at different temperatures. Mar 24, 2025 · Wondering what's the difference between 5W-30 and 5W-40 oil? Our Chief Mechanic goes into detail about their recommended use. 5w20 vs. Mar 9, 2023 · When choosing oil for your engine, you are met with a lot of choices. Feb 6, 2025 · Do you ever feel a ¨car dictionary¨ is necessary? Or maybe a guide of basic car stuff? We haven´t come up with a guide yet, but here are the basics of motor oil when it comes to the numbers on the label. When the engine is running and hot, 5w40 and 10w40 have high viscosities and are equally effective in protecting against engine wear. A guide for global distributors and agents. Jul 25, 2025 · Difference Between 5W and 10W Oil: Which Is Right for Your Engine? EllieB Imagine starting your car on a freezing winter morning. Nov 4, 2023 · We often confuse motor oil grades and use the wrong oil, which impacts the engine’s performance and durability. Here’s a detailed comparison to help understand the differences: Apr 15, 2025 · Multigrade or monograde? 0W-30 or 5W-30? This guide helps drivers understand oil viscosity and how to choose the right engine oil based on their driving habits. Explore 5W-30 oil’s meaning and whether it’s the right oil for your car. Oil Viscosity Explained The term “viscosity” refers to the thickness of the oil and its resistance to flow. Take 0w40 vs 5w30, for example. The 15w40 motor oil can be used in off-highway diesel equipment, farm tractors, over-the-road diesel trucks, passenger What does 5W40 mean? The designation 5W40 stands for the SAE class according to which the engine oil was classified. The main differences between 15w40 and 5w40 The main differences between 15w40 and 5w40 refer especially to how well these two types of engine oils help the engine regarding the ambient temperature in which they are used. Place your order online and pick it up at your local store for free. The two numbers in the 5W-40 indicate the weight or viscosity of the engine oil as tested by SAE. The ‘W’ in the oil grade stands for winter. 5w30 Toyota The recommended oil for all Toyota engines is 5w30 motor oil. Dec 7, 2022 · Know the differences between 5W-30 and 5W-40 oil? Our guide goes through their benefits and differences to help you choose the right oil type for your car. 5w30 oil, and which is better? Jul 19, 2022 · You can also check SAE 30 Vs 10W30 Rotella T6 5W40 Vs 15W40 So, what are the key differences between Rotella T 15W40 and Rotella T 50? The main difference is that Rotella T 50 is a heavier-weight oil, meaning it will provide more protection for your engine at high temperatures. However, there is no mention of the 15w40 motor oil for these engines, so it might be better to avoid it. When selecting oil, it’s important to consult manufacturer recommendations as they Mar 28, 2022 · Discover the differences between 5w40 and 15w40 oils. 5W-40 oil is a versatile and high-performing engine oil that provides optimal protection and performance for a wide range of vehicles. Viscosity Index: The viscosity index is however less in 5w40 than 0w40 oil. Feb 13, 2024 · For many car owners, choosing the right engine oil feels like deciphering an ancient language. On the other hand, the temperature range for 5w40 is -35°C to +40°C. Sep 23, 2023 · 5w40 vs. The first number indicates the viscosity of the oil at a cold temperature, and the second number indicates the viscosity at operating temperatures. Viscosity is defined as a fluid's resistance to flow: The higher the number, the higher the fluid's resistance to flow, or the thicker the fluid. When it comes to 5W30 vs. What does 5w40 mean? 5w40 is the grade of the oil. 5W40, what are those differentiating factors? Which one is suitable when? Learn all those answers here! Jan 28, 2020 · How to Choose the Right Engine Oil To choose the right lubricant for your vehicles, use the viscosity grade(s) recommended by the original equipment manufacturer (OEM) for the life of the engine and especially during the engine's warranty period. In this comprehensive guide, we’ll delve into the world of 5w40 engine oil, exploring its characteristics, benefits, applications, and how to determine if it’s the right choice for your car. What do 5W-30 and 10W-40 mean? Learn how engine oil viscosity affects your car, why seasons matter, and when to visit Federal Way Automotive for an oil change. What does the "5W" stand for? The first part of the rating—"5W When choosing an engine oil for your car, there are two things you need to take into account- the temperatures in your region and the vehicle manufacturer’s recommendations. Castrol's oil viscosity chart makes it easy to understand oil weight, thickness and grades. 5W40 motor oil has a winter viscosity grade of 5, meaning it’s less viscous at very low temperatures, compared to for example a 10W40. 5w50:Which oil is better? Actually, every oil contains different characteristics and viscosity. Learn from the Repco team why these numbers are important to select the right oil for your car. Motor Oil Viscosity Grades What does the SAE Viscosity rating on your Motoroil bottle mean? How do they come up with this rating . Mobil 1 FS 5W-40 keeps your engine running like new and protects for 10,000 miles* *Protects for up to 10,000 Jan 15, 2024 · Can 5W-40 Full Synthetic Motor Oil be Used in Formula 1 Racing? It is a very good oil, with improved qualities and enhanced protection, and a common choice for passenger cars and heavy trucks altogether. The cryptic codes like "5W40" and "0W40" often leave us bewildered, leading to rushed decisions and Explore how motor oil grades influence engine protection, efficiency, and long-term health, with expert tips on making the best choice for your vehicle's needs. its flow properties as a function of various operating temperatures. So do I need 5w40 or 10w40? The choice between 5w40 engine oil and an alternative like 10w40 depends on the winter temperature in your region. Viscosity determines an oil’s thickness and ability to flow at different temperatures. Dec 15, 2022 · What does 5W40 oil mean? You might be familiar with the term that ‘W’ indicates in 5W40 oil. But what exactly does this designation mean, and what types of vehicles are best suited for this particular oil grade? Oct 4, 2023 · First things first, let’s chat about the whole Oil Viscosity Impact thing. These numbers aren’t just technical jargon; they Apr 24, 2025 · Discover essential facts about the best 5W40 fully synthetic engine oil, including market trends, performance, and environmental benefits. A higher temperature is usually about 150 degrees Nov 6, 2024 · Understanding Motor Oil Viscosity Ratings Motor oil is vital for the performance and longevity of your vehicle\'s engine. These are ideal for starting engines at low temperatures and are effective at high engine temperatures, meaning they can be used in most conditions, but how Jan 24, 2022 · Explore 5w40 vs 10w40 oil comparison to choose the right one for your vehicle. Feb 20, 2024 · Hesitating between 5W-30 and 5W-40 engine oils? Uncover the essential distinctions that could transform your engine's performance. The number before the letter ‘W’ represents the viscosity of the motor oil at lower temperatures. E. 5W-40 engine oil 5W-40 engine oil is extremely adaptable, handling a wide range of temperatures and maintaining its efficacy both in low winter temperatures and when operating in hotter environments. 15w40 can be used in the temperature range of -20 °C or -4 °F and +40 °C or 104 °F, on the other hand, 5w40 is used between -30 °C or -22 °F and +40 °C or 104 °F. Engine oil with class 5W40 is a multigrade oil, i. One key thing to know is “oil viscosity,” which tells you how thick or thin the oil is. ‘5’ or ’10’ shows how thin the oil is and its flow rate through engine components at colder Jun 5, 2025 · Discover the benefits of 5W40 engine oil vs 5W30, key differences, ideal applications, and why TERZO oils are trusted in hot climates. The number before the "w" (which stands for winter) represents the oil's viscosity at low temperatures, while the number after indicates viscosity at high temperatures. It means ‘Winter’. Motor oil gets thicker when it’s cold and thinner when it heats up. 5w50 Toyota The recommended oil for all Toyota engines is 5w30 motor oil. We’ll also go through some related FAQs, including why cars use multigrade oils. 5w50 Nissan The The main difference between 5W30 and 10W40 motor oils lies in their viscosity characteristics. What Does LL-01 Oil Mean? Mar 12, 2025 · Among the various viscosity grades available, 5W-40 engine oil has gained significant popularity. 10w30 oil is thicker than 5w40 at colder temperatures, meaning it flows slower in low-temperature conditions. Both 0w40 and 5w30 are synthetic multigrade oils. The 5w40 synthetic motorcycle oil is a lightweight engine oil with low Apr 15, 2024 · What Do the Numbers Mean for Oil Viscosity? The numbers on oil viscosity indicate how easily the oil pours at different temperatures. What do these numbers mean? The engine type and the detergent additive may be labelled with two letters standing alone on the oil. 5W-40 is better for starting your engine at low temperatures as it flows more easily at these temperatures. In the automotive industry, oil weight does not mean how heavy the oil is, but it is used in measuring the oil thickness or viscosity. Apr 15, 2024 · 5W-40 motor oil is a viscosity grade recommended for various vehicle engines for optimal performance. g. Lower numbers mean the oil flows more easily at lower temperatures. These grades are classified by the Society of Automotive Engineers (SAE) using numbers and letters such as 5W-30, 10W-40, or 15W-50. The first number before the letter “W” refers to the viscosity of the oil at cold temperatures. Here we explain what engine oil grade descriptions like 0W-20 and 5W-40 actually mean. really? Most of the time when viscosity is explained words are used that are too technical for the average person to quickly grasp. The name of the 15w40 engine oil is implanted along with its specification about initiating the process of lubricating an engine. Viscosity grades are primarily recommended according to the expected ambi May 8, 2025 · Choosing the right oil for your car is really important to keep your engine healthy. However, it can lead to higher cranking resistance, which affects engine dynamics, and its wider temperature range correlates with a shorter life. Jun 12, 2025 · Following our detailed comparison of 5W30 vs 5W40, this guide explores the deeper meaning of oil 5W40, decoding how it works and why it’s a preferred option for hot climates, turbocharged engines, and commercial vehicles. But I have always heard the latter number was what the wt of the oil is considered, until I talked to a spokesman on the Mobil website. e. But what about 10W40 motor oil? Where is 10W40 oil used? In this article, we’ll do our best to explain 10W-40 motor oil — what the numbers mean, and where this oil is used. The choice between 5w40 motor oil and an alternative like 10w40 depends on the winter temperature in your region. The figures on either 5W40 is a motor oil that penetrates to the active mechanisms faster, and provides excellent lubrication on start up. 5W30, 15W40, 10W40 – we’ve all encountered designations like these when choosing engine lubricants, but what do they mean and why do they matter when choosing engine oil? These figures represent the engine oil’s viscosity grade, which is the lubricant’s level of fluidity and efficiency at low and high temperatures. However, for providing higher pressure, 5W40 is superior. Feb 24, 2020 · So do I need 5W-40 or 10W-40? The choice between 5W-40 engine oil and an alternative like 10W-40 depends on the winter temperature in your region. In a 5W-30 for…. To choose the right oil, you need to understand different oil grades and how they perform in different conditions. Sep 30, 2023 · 5W30 engine oils has a narrower temperature range then 5W40. Oct 4, 2024 · Explore why 5W-40 synthetic oil is the top choice for modern engines, offering superior lubrication and extended engine life. 5w40 is better for starting your engine at low temperatures as it flows more easily at these temperatures. You’re probably familiar with 5W-30 and 5W-20 motor oils. The W means winter as it is classified using a conventional categorization system. 5W30 and 5W40 are some of the most popular types of oil used for car engines. The discussion on 0w40 and 5w40 will tell you the two oils are both synthetic, though, in some oil brands, you may find the 5w40 to be a synthetic blend. The truth is, there’s no universally “better” oil; the optimal choice depends on a variety of factors, including your car’s engine type, the climate Find the right O'Reilly Full Synthetic Motor Oil 5W-40 5 Quart for your vehicle at O'Reilly Auto Parts. 5w40 is a designation for engine oil that indicates its viscosity rating and performance level. Learn which oil is best suited for your diesel engine's needs. Learn about viscosity, API, ACEA, ILSAC ratings, and OEM approvals. It offers better high-temperature stability and is tailored for optimal engine protection. These oils have universal characteristics that allow their use in various engines. Its name refers to how well the oil type can help the engine regarding the ambient temperature in which they are used. , these codes are SE or CD. These are “Full SAPS” oils, meaning they pack traditional anti-wear additives and detergents designed for maximum engine cleanliness and durability. 5W30 is a thinner engine oil compared to the 10W40. We would like to show you a description here but the site won’t allow us. 0w40 has a lower viscosity at low temperatures and a higher viscosity at high Jan 25, 2024 · 10w30 and 5w40 are both multi-grade motor oils, indicated by their respective viscosity ratings. 5W30 vs 5W40 Oil: Which One Should You Be Using?. The letter ‘W’ stands for winter, and the numbers represent the viscosity of the oil (or thickness). Where this is vitally important is in an engine’s bearing clearances. The numbers on the oil bottle, like 5W-30 or 10W-40, show how the oil works in cold and hot temperatures. Jun 5, 2025 · Discover the benefits of 5W40 engine oil vs 5W30, key differences, ideal applications, and why TERZO oils are trusted in hot climates. What do the numbers in 5W-40 mean? The numbers refer to the weight and thickness, or viscosity, of the oil. 5w40 oil is pretty thick stuff, meaning it can give your engine some serious TLC by providing top-notch lubrication and keeping wear and tear to a minimum. Mar 2, 2025 · Because the viscosity of oil changes with temperature, multigrade oils were developed to provide protection across a range of temperatures. Discover the ultimate Engine Oil Weight Chart to choose the right viscosity for your vehicle. Mobil 1™ FS 5W-40 European Car Formula is an advanced full synthetic motor oil engineered for the latest gasoline and diesel (without DPFs) engine technology delivering excellent all-around performance. This ensures that engines are adequately lubricated even in colder temperatures. While the number after the letter “W” signifies the Engine Oil Grades Chart Read Engine Oil Thickness Chart (A to Z Guide) What Are Engine Oil Grades? Engine oil grades indicate the viscosity of the oil, which determines how well it flows at different temperatures. On the other hand, the number succeeding the letter ‘W’ represents the oil viscosity at higher operating temperatures. 10W-40: This oil is a little thicker in the cold compared to 5W, but it maintains a higher viscosity at operating temperature, meaning it provides a thicker film of protection when hot. Understand viscosity ratings, cold weather performance, and how to choose the right oil for your vehicle. We discussed every single aspect for better knowing. Among the many options, 5W40 and 5W30 are frequently compared, leading many car owners to wonder which is the better choice for their vehicle. What do these numbers and letters mean, anyway? The numbers are used to represent oil weight in the industry. These viscosity grades are commonly used in most modern passenger car engines. However, this is a bit misleading. Jul 9, 2018 · Learn about motor oil weights like 5W-20 and 10W-30. Apr 16, 2025 · Understanding the role of engine oil and its various classifications is essential for making informed decisions about your vehicle’s maintenance. That means 0w40 oil’s viscosity changes more than 5w40 under any change of temperatures. Oil suppliers incorporate thin base oil additives to make a 5W-40 oil behave like one-oil with a 5-oil cold grade, but then it acts as one-oil with a 40 rating when oil heats up. Each of these oils is designed to cater to specific needs and standards. Engine Oil Equivalent Chart: Find accurate oil grade substitutes with our complete comparison table for SAE, ISO, and AGMA standards. "Would you recommend a 5W-40 or 15W-40 diesel lubricant for a tropical weather country? Would 5W-40 be less viscous compared to 15W-40 diesel engine oil for cold starts in the morning? What would be the effects on the engine's performance and protection? This will be put to use on fleet in a tropical weather country with an average of 32-37 degrees C at midday and high humidity (60 percent Aug 19, 2024 · AMSOIL offers a range of motor oils specifically formulated to meet the unique requirements of European vehicles. it has good flow properties at cold and warm May 27, 2023 · 5w40 is a multigrade type of engine oil that can be used in any season, it blends synthetic crude oil and petroleum. So Nov 21, 2021 · 15w40 vs. Jun 13, 2024 · 5W-40 oil is a multi-grade engine oil that is widely used in various automotive applications. Applications of 5W40 Motor Oil Since 5W40 is thicker under heat than an average oil, most mechanics Learn about 0W motor oil and viscosity by reviewing these frequently asked questions that consumers have regarding both topics. The SAE class describes the viscosity of an oil, i. Some of the most commonly recommended grades for car are 5w30 and 5w40 engine oils. Higher numbers mean the oil maintains viscosity at higher temperatures. Dec 8, 2021 · What Is the Difference Between 5w40 and 10w30 Oil? The 5w40 motor oil and 10w30 motor oil might have similarities, but they also have differences. Apr 9, 2025 · 5W-40 engine oil is a popular choice for a wide range of vehicles, offering a balance of low-temperature flow and high-temperature viscosity. This section lets us compare 5w40 motor oil and 10w30 motor oil in fuel economy, hot weather, and viscosity. Temperature Range: The temperature range of 0w40 is -40°C to +40°C. Composition 5W40 is often synthetic, meaning it’s made from artificially engineered compounds. In this guide, we look at the various types of vehicle lube grades and Nov 7, 2023 · What Does These Numbers Mean in 5W40 and 10W40 Oil? The numbers on the motor oil container indicate the viscosity grade of the oil. One crucial aspect of motor oil is its viscosity rating, often represented by a combination of letters and numbers—like 5W-40. Wondering whether to use 5W30 or 5W40 motor oil? Learn the key differences between these multi-grade motor oils. Jan 21, 2023 · Awesome guide on Synthetic 5w40 oil benefits for car and how to choose the right synthetic engine oil for the perfect driving condition. This also means that, depending on the type of fuel it is meant for, the additives have different profiles. The specific car oil you should use in your vehicle will be noted in the owner’s handbook or can be found using tools such as TotalEnergies Lub Advisor. This means that this type of 15w40 motor oil is formulated for use in engines where oil is multi-grade mineral-based oil. Discover how factors like climate Feb 3, 2023 · February 3, 2023 - Let’s dive deeper into the meaning behind the naming system of engine oil grades and their unique properties to make choosing the correct engine oils a bit easier. Still, refer to your owner’s manual. So do I need 5w40 or 10w40? The choice between 5w40 motor oil and an alternative like 10w40 depends on the winter temperature in your region. To grasp what 5W-40 means, we need to understand how this coding system works. Jun 11, 2025 · What does 5W-30 or 10W-40 actually mean? Here's why knowing your oil grade is important to the health of your engine. Sep 20, 2023 · 5w40 Vs 15w40: Major Differences Built quality The 5w40 engine oil is a multi-grade mineral-based oil. For example, SAE 5W 40 and SAE 10W 40. Optimize performance & engine life with expert insights! Apr 25, 2025 · Synthetic vs Conventional: Choosing the Right Oil Synthetic oils, such as those available in 5W-30 and 10W-40 grades, usually offer superior wear protection compared to conventional oils. 5W-30 oil offers flexible performance across different temperatures. But you can use 5w40 for starting your engine at a low temperature. Engine oil numbers refer to the viscosity of the oil. Understand how viscosity affects your engine's performance. As demand rises in regions like Africa, Southeast Asia, and South America, understanding the viscosity, formulation, and application of 5w40 engine oil is essential for 3 days ago · The primary difference between 5W-30 and 5W-40 is in each oil's high-temperature performance, since they perform similarly at low temperatures. Also Read: 5w30 vs 10w30 – What is the Difference? First forward, the 5W40 oil is identified differently from 10W40. Simply put, viscosity is the oil Jan 14, 2025 · 5W-30: This oil flows well in cold temperatures (the lower the first number, the better it flows in the cold) and maintains a stable viscosity when hot. What is 5w40 Engine Oil? As we’re comparing between 5w40 vs 10w40, remember that the 5w40 is lightweight and thin engine oil than that of 10w40. Perfect for year-round use, 5W-40 motor oil flows easily at cold temperatures and remains stable under heat stress, ensuring smooth engine operation. In your case, you need to draw a line between 5W40 and 10W40 so you may know if any of these two engine oils will work best for your motorcycle. Dec 8, 2021 · 5w40 vs. The '5w' in both 5w30 and 5w40 signifies that the oil has a viscosity of 5 in winter conditions, meaning they are designed to remain fluid and offer protection during cold starts. Find out what API, SAE, ACEA, ILSAC and other engine oil labels mean so you can get the right oil for your car Jul 1, 2025 · Choosing the right engine oil can feel like navigating a complex maze of numbers and acronyms. In terms of oil flow, 5W30 has greater flow than 5W40. arkjxc sxl gxjs tdlecce ahrg dhe oqvei owxtlnz hsm ydjcyc ifwotpn pdwpc acfwm ipaygwx bddcs