time about 3 months the oeldruk at a longer incline ride on the highway to about 1.5 bar at the same time the temperature display goes to about 110 degrees c after an oil and filter Wecksel has hardly changed anything the car has 270tsd km I am second owner time 1996 the car had then 90tsd km and was original Schekheft at mb after that I have maintained myself the oil and filter Wecksel all 7000km with castrol gtx diesel 15\40 btaedt ein neuer oil und filter Weckersel with original mb filter and mobile synthetic oil 0\40 had nothing changed on the matter although the engine is very quiet that is the beginning of end or does someone see another solution? thank you in advance to all