![]() It can also happen that manufacturers create their own specific set of requirements for their engines. Brand specifications (OEM, Original Equipment Manufacturer) You can learn more about API specifications on the API official site. As with ACEA specs, the specifications can be combined when the oil is suitable for both diesel and petrol engines. For example, an API SN oil is better than an API SJ. The lowest quality is the letter A, and each letter after A represents better quality. The second letter of the specification indicates its quality. F for modern Diesel engines (introduced in 2017): this new specification aims at reducing fuel consumption.They use a two letter specification, dividing them into: On the other hand, we have API (American Petroleum Institute) specifications. You can find more details about the differences between all specifications in the official ACEA PDF, specifically on page 4 and 5. C: Catalyst compatible oils, which also extend the DPF life.They are usually combined in the specification. The ACEA specifications cover passenger and commercial engines, divided into the following sections: They put oils through a series of tests, which get updated when new legislation, new technologies or other reasons demand change. The ACEA (Association des Constructeurs Européens d'Automobiles) has its standard regarding the specifications of oils. Oil specifications - ACEA vs APIĪpart from the viscosity index, there are other factors to consider when choosing an engine oil for your vehicle. For example, a 75W90 transmission oil doesn't have a higher viscosity than a 15W40. If you are interested, you can see more information regarding SAE specifications here.īut be careful: transmission oils have a different SAE numbers. Here you can see the recommended oil for each ambient temperature: You should be aware of climate changes in order to keep your engine fully functional. The number before the W represents the oil viscosity at lower temperatures, while the second number (after the W) indicates the viscosity at operating temperatures.įor example, this means that 5W30 engine oil has less viscosity at lower and higher temperatures when compared to 10W40. The SAE (Society of Automotive Engineers) established a numerical code to represent the viscosity of oil at both hot and cold temperatures. Some synthetic oils are able to achieve this variation without additives. To be able to change the viscosity index, conventional oils incorporate additives, usually plastic polymers. Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at high temperatures. The viscosity changes with temperature to ensure protection and operability under all circumstances. A higher viscosity implies a slower flow and a thicker fluid. ![]() Viscosity is simply the resistance of a fluid to flow. After a brief review of the use of engine oil, we will now move on to one of the most important concepts: oil viscosity index.
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