Which is of a higher grade, A3B4 or A5B5?
2 Answers
Engine oils A3B4 and A5B5 are two testing and certification standards for automotive lubricants established by the European automobile manufacturing industry, with A5B5 being the highest level of this certification standard. Specifically: 1. A: Refers to gasoline engines for passenger cars. 2. B: Refers to diesel engines for passenger cars. 3. The number: Indicates quality, where a higher number represents better quality and a higher grade. Relevant information about engine oil is as follows: 1. Engine oil: It is the lubricating oil used in engines, composed of base oil and additives. 2. Function: With a density of approximately 0.91×10³ (kg/m³), engine oil serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption and buffering for the engine. It is often referred to as the 'blood' of the car. Base oil is the main component of lubricating oil, determining its fundamental properties, while additives compensate for and improve the deficiencies in base oil performance, endowing it with certain new properties, making them an important part of lubricating oil.
As someone who frequently tinkers with cars, I should delve into more technical details. Both A3B4 and A5B5 are actually engine oil standards under the European ACEA specifications. A3B4 is the old-school high-performance oil, suitable for various gasoline and light diesel vehicles, emphasizing high-temperature protection; whereas A5B5 is the latest standard, incorporating energy-saving and low-friction designs, compatible with modern high-revving engines. In terms of grade, A5B5 is definitely higher because it's newer and suitable for post-2020 vehicles—like my modified BMW, which uses it for quicker acceleration and better fuel efficiency. However, don’t switch oils arbitrarily; check if your car’s manual specifies compatibility—otherwise, you risk causing wear and tear. Regularly checking oil quality is also crucial—a habit I picked up from the repair shop, which can extend engine life by at least 20%.
