What do the motor oil classifications SAE, API and ACEA mean?
The SAE classification indicates the oil viscosity, i.e. flow. The smaller the number the thinner the oil. The API and ACEA classifications define the suitability of the oil for various kinds of motors, such as gasoline or diesel, with or without a turbo, etc. The classifications are explained in Neste’s guide to vehicle lubrication available at, e.g., Neste service stations.
