hello. tomorrow I went through all the points of the departure check and I noticed two points where I don’t really know. so the vehicle is a mercedes benz axor and here my questions:1.Checking the liquid level for the servo steering!!is the front of the tank next to the filling nozzle for motor oil?I don’t know more exactly. 2.Checking the condition display of the air filter system!!what! and where should I please do that? hope you can help me. Mfg