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How to Choose Engine Oil

Updated: Nov 21

AMSOIL Motor Oil Bottles

Choosing Your Engine Oil: A Brief Overview


Engine oil is one of the most important components in keeping your vehicle's engine running smoothly. It acts as a lubricant, reducing friction between the engine's moving parts, preventing overheating, and ensuring that the engine performs at its best. Choosing the right engine oil is essential for the longevity and efficiency of your vehicle’s engine. With so many types, brands, and specifications available, it can be overwhelming to know which one to choose. This article will guide you through some important points you need to consider when selecting the right engine oil for your vehicle.


1. Understand the Types of Engine Oil


There are three main types of engine oil: conventional, synthetic, and semi-synthetic. Each type has its advantages and is suited for different types of driving and engine needs.

  • Conventional Oil: This is the most basic and affordable type of engine oil. It is made from refined crude oil and provides adequate lubrication for most standard engines. Conventional oil is generally suitable for older vehicles or those that are used for less demanding driving, such as city commuting or short trips.

  • Synthetic Oil: Synthetic oil is chemically engineered to offer superior performance compared to conventional oil. It performs better at extreme temperatures and provides better protection against engine wear. Synthetic oil is ideal for high-performance engines, modern vehicles, and those that are used for heavy-duty tasks, such as towing or long-distance driving. It also has a longer lifespan, meaning you can go longer between oil changes.

  • Semi-Synthetic Oil: Also known as synthetic blend oil, this type is a mixture of synthetic and conventional oils. It offers a balance between the affordability of conventional oil and the enhanced performance of synthetic oil. Semi-synthetic oil is a good choice for vehicles that require better protection than conventional oil but don’t necessarily need full synthetic oil.


2. Consider the Viscosity Rating


Viscosity refers to the thickness or flow resistance of the oil. Engine oils are classified by their viscosity using a two-number system, such as 5W-30, 10W-40, or 0W-20. The first number followed by "W" (which stands for winter) indicates the oil’s performance in cold temperatures. The lower the number, the better the oil will perform in freezing conditions. The second number refers to the oil’s thickness at high temperatures, with higher numbers providing thicker oil for better protection at high engine temperatures.


When choosing the right viscosity for your engine, you should consult your vehicle’s owner’s manual to see the manufacturer’s recommendations. Generally, if you live in a region with extreme cold winters, a lower first number (like 0W or 5W) would be preferable. On the other hand, if you live in an area with hot climates or have a high-performance vehicle, you might need a higher viscosity oil to provide sufficient lubrication under heat and stress.


3. Check the API Rating


The American Petroleum Institute (API) sets the standard for engine oil performance, and oils are often labeled with an API rating. The API rating is typically represented by a two-letter code, such as “SN” or “SM.” The letter “S” indicates that the oil is suitable for gasoline engines, while “C” denotes oils that are intended for diesel engines.


The second letter indicates the oil's performance level. The higher the letter in the alphabet, the more advanced the oil’s formulation. For example, “SN” is a newer standard than “SM.” When choosing engine oil, ensure it meets the latest API specifications that are compatible with your engine. You’ll find this information in your vehicle's owner’s manual.


4. Know Your Engine’s Requirements


Different engines have different needs based on factors like age, design, and the way they are used. For example, high-performance engines, such as those in sports cars, require oils with advanced formulations to maintain high levels of lubrication at high speeds. Diesel engines, on the other hand, require oils formulated for their specific needs, as diesel engines operate at different temperatures and pressures.


If you have an older engine, you might need oil with higher levels of detergent and dispersants, which help keep sludge and deposits from building up. For new cars, many manufacturers recommend synthetic oil for optimal performance and efficiency. Always check your car’s manual for manufacturer-recommended oil specifications, as using the wrong oil can lead to engine damage or void your warranty.


5. Consider the Brand and Price


While price shouldn’t be your only consideration, it is important to choose a reputable brand that offers high-quality oil. Established brands like AMSOIL, Mobil 1, Castrol, Shell, and Valvoline are known for producing high-performance engine oils. These brands often undergo rigorous testing to ensure they meet industry standards.


It’s also essential to weigh the cost. Synthetic oils generally cost more than conventional oils, but they provide better protection and require fewer oil changes. If you own a high-performance vehicle or plan on keeping your car for a long time, the additional cost of synthetic oil might be worth the investment. However, if you're driving a more standard vehicle and perform regular oil changes, conventional oil may be sufficient.


6. The Right Oil Change Interval


Another factor to consider when choosing engine oil is the recommended oil change interval. Modern oils, especially synthetic oils, can last longer than older formulations. Many vehicles today recommend oil changes every 7,500 to 10,000 miles, depending on the type of oil used. AMSOIL Signature Series can go up to 25,000 miles before an oil change. Be sure to follow your vehicle manufacturer’s recommended oil change intervals to maximize engine longevity and performance as well as reviewing the details of service life of the oil you choose by looking at the data bulletin.


How to Choose Engine Oil: Conclusion


Choosing the right engine oil is crucial for maintaining the health and performance of your vehicle. Consider the type of oil (conventional, synthetic, or semi-synthetic), the oil’s viscosity rating, the API rating, and your engine's specific requirements. Always refer to your vehicle’s owner’s manual for the correct specifications and follow the recommended oil change intervals. By making an informed choice, you ensure that your engine is well-protected, running efficiently, and ready to handle whatever driving conditions come your way.


*If there is any discrepancy in the information in this article and the AMSOIL Corporate website, the latter will be taken as correct.

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