What does A3/B4 engine oil mean?

[MatteoDella]

Engine oil A3B4 refers to the grade certification of the engine oil. Oil quality: First, it is the evaluation standard for engine oil quality grades set by the American Petroleum Institute (API). S stands for gasoline engine oil. L represents the grade, ranging from API SA, SB, SC, SE, SF, SG, SH, SJ, SL, SM. The further the letter goes, the higher the oil grade. SL is currently the highest-quality engine oil in the world. C stands for diesel engine oil. F represents the grade, ranging from API CA, CB, CC, CD, CE, CF, CF-4, CG-4, CH-4. The further the letter goes, the higher the oil grade. Oil viscosity: Second is the standard of the Society of Automotive Engineers (SAE), also known as the standard for measuring oil viscosity, which can be divided into single-grade viscosity and multi-grade viscosity. For example: SAE 15W-40, SAE 5W-40. "W" stands for winter. The smaller the number before it, the better the low-temperature fluidity of the oil, indicating a lower usable environmental temperature and better protection for the engine during cold starts. The number after "W" (after the hyphen) is an indicator of the oil's high-temperature resistance. The larger the number, the better the oil's protective performance at high temperatures.

[MacKiara]

A3/B4 engine oil is a high-performance lubricant specification under European automotive standards, typically used in vehicles with gasoline or light-duty diesel engines. It is primarily designed for high-performance vehicles, such as those with turbochargers or frequent long-distance driving, offering superior protection, reduced engine wear, prevention of carbon buildup, and extended oil change intervals. When selecting engine oil, I always check my car's manual first, as not all vehicles are suitable for A3/B4. For example, some regular family cars might find A5/B5 sufficient for fuel efficiency, while A3/B4 is better suited for those prioritizing performance. From practical use, I've noticed significantly reduced engine noise and more stable fuel consumption after switching, though the price is slightly higher. Therefore, budget-conscious buyers should weigh the cost-effectiveness. Using the right oil during regular maintenance is crucial to avoid minor issues turning into major repairs.

[ChaseLee]

When I first used A3/B4 engine oil, I was immediately drawn to its performance. As a premium category of motor oil, it originates from European standards, meaning it is compatible with both high-performance gasoline and diesel engines. Its main features include strong anti-wear properties, high cleanliness, and the ability to keep the engine running stably under high temperatures. Having driven several different car brands, I found that A3/B4 is particularly suitable for vehicles that frequently travel at high speeds or carry heavy loads, as it effectively prevents piston ring sticking or sludge formation. Compared to conventional oils, it lasts longer before requiring an oil change, saving both time and money in the long run. However, it's important to note that some older engines may not be compatible, so always check the manufacturer's recommendations before use to avoid potential issues. I recommend that novice car owners start with basic oil types and upgrade only after gaining more experience.

[McHannah]

A3/B4 engine oil represents the high-standard lubricants set by the European Automobile Manufacturers' Association, specifically designed for high-performance engines. It is suitable for both gasoline and diesel vehicles, enhancing shear resistance and thermal stability. After using it, I found that the oil change interval can be extended to over 10,000 kilometers, reducing maintenance frequency. This specification emphasizes protection for internal engine components, preventing excessive wear.