1992 Mercedes-Benz 300SE Q&A
1992 Mercedes-Benz 300SE Question: Why is my mercedes 92 300 se losing oil?
i recently changed the oil in my 1992 mercedes 300se.a few weeks later the oil light came on and the engine oil was completely gone. it isnt leaking out and the engine isnt smoking or anything. The engine is in good condition and only has 135000 on it. I used 10w40 oil in it. It is also a gas engine. - merced300
For oil to disappear the engine has to consume it or leak it. Oil leaks should be obvious. If the engine is consuming oil the tail pipe may show signs of oil inside it or the back of the car may have a fine mist of oil on it. It is normal for an engine to require a little engine oil between services. For an engine to require excessive amounts of engine oil between services means the engine is either burning oil or leaking oil. Leaking oil should be pretty obvious, look for leaks underneath the engine at the oil filter, oil drain plug, and oil filter. Look for oil leaking from the timing belt cover area/timing chain cover and valve cover gasket. If an engine is "burning oil" look at the tail pipe and rear bumper for signs off discoloration or black oily deposits oil. Oil may leak down the valve guides particularly after the engine has been shut off and started from cold,if so blue oil smoke may be emitted from the tail pipe on start up, (this may also be noticeable if the car is left idle for a few minutes and then accelerated away for example after sitting at a traffic light). If the piston oil control rings are worn the engine normally smokes on acceleration. Oil control rings may fail due to an engine that has badly overheated or has had infrequent engine oil changes. Frequent oil changes with good quality oil is critical to long engine life. Perhaps changing oil viscocity to the next "thicker" grade would help. - patrick mannion