Mercedes-Benz W126 oil pressure and oil pressure gauge
280 SE
W126 oil pressure is low even though the oil has been changed, what is the cause?
A common cause is a clogged oil filter, if it was not replaced at the oil change. After a new filter the pressure rises to normal. Other suspects are the sensor, and a head gasket leak if there is foam on the oil filler cap.
The W126 oil pressure gauge goes full as soon as the ignition is switched on, what is the fault?
Usually it is a matter of the sensor wire or the sensor itself. If the wire breaks or comes off, the gauge shows full. In the test the sensor wire is grounded: if the gauge stays at zero with the ignition on, the fault is in the sensor.
What are the oil pressure reference values for the M103 engine?
In gear: 600 rpm 0.7 bar at an oil temperature of 90 and 0.6 bar at 130. 750 rpm 0.9 bar. 1000 rpm 2.0 bar (90) and 1.3 bar (130). 2000 rpm 4.3 bar (90) and 3.5 bar (130).
Related articles
Mercedes-Benz W126 heater blows only hot airMercedes-Benz W126 heater not heating or heat disappears while drivingMercedes-Benz W126 K-Jetronic cold start injectorMercedes-Benz W126 runs too rich: causes and lambda sensor checkMercedes-Benz W126 fuel pressure regulator and pressuresMercedes-Benz W126 clogged and leaking fuel injectorsMercedes-Benz W126 idle speed and high idleMercedes-Benz W126 auxiliary air valve and idle control valve