Since the fields of application of neighboring SAE classes are the same, short-term temperature fluctuations should not be taken into account. It is permissible to mix oils of different viscosity classes if topping up is done once and the external temperature no longer corresponds to the viscosity class of the oil in the engine.
For C-class gasoline engines, API specification SF and SG engine oils are suitable, and for diesel engines, API-CD.
European oil manufacturers additionally set the CCMC specification, which takes into account European engine manufacturing technology and is becoming increasingly important. Oils for gasoline engines in SSMS are designated from class G1 to G5.
For gasoline engines, Mercedes prescribes CCMC-G4 as a minimum standard for multigrade oils; CCMS-G5 refers to easy-flowing oils with low viscosity.
These standards roughly correspond to the SG API specification, which additionally meets European requirements.
For class C diesel engines, API CE and CF-4 engine oils are suitable, and for gasoline engines, API-SF and SG.
Oils for gasoline engines in SSMS are designated from class G1 to G5. Passenger car diesel oils are in specification CCMC - D4, D5 and high quality specification CCMC-PD2, CCMC-D4 is roughly equivalent to API-CE; CCMC-D5 is similar to API-CF-4.
For normal operation of the car, the use of CCMC-D4 engine oil is sufficient. High quality oils of classes D5 and PD4 can also be used at any time. It is essential to use standard CCMS oil of API CE and CF-4 specifications.
In each individual case, follow the principle of using engine oil recommended by Mercedes-Benz (marked on the oil can).