What's a normal temperature of Mercedes Benz - Mercedes-Benz Cars & Trucks

You have an air lock some where or thermostate not working properley

The oil in the reservoir tank ( radiator ) may be from a cracked transmission oil cooler in the radiator. Have it pressure tested

ekectric components are gittn hot from wear--ignition and fuel pump are common with age--need to do test to confirm

replace the coolant temperature sensor.

Normal temeperature of coolant for driving is 90C. Higher is dangerous for overheating.

1996 Mercedes Benz C Class
Engine Oil Type/Weight/Capacity

Application:
Oil for use in temperatures above 23 degrees

Note :
5 4/5 Quarts with filter change

945
Application:
Oil for use in temperatures above 23 degrees

Note :
Valvoline SynPower Full Synthetic
20W-50 Motor Oil

Hope helps (remember comment and rated this).

Mercedes has a cold start valve to spray extra fuel to assist the ignition when the temperature is cold. This is the problem with the cold start valve is not opened when it needed. There are 2 possible causes: 1- The valve is bad. 2- The coolant temperature sensor is bad.
The valve part is expensive and labor is not cheap. The first economic way to address is to replace the coolant temperature sensor. This sensor gives a different resistance reading as temperature changed. When it is bad, it give an erratic reading at cold temperature so the ECM could not recognize to give a signal to open the Cold start valve.

Temperature control sensor is located a)oil sensor on the oil filter b)coolant sensor engine block cover

hi,renew your dryer tank,ty

Get a new cap it it still happens replace the coolant tank.