Engine oil problem in BMW E34 with an easy fix

I started my car few days ago normally, when the onboard diagnostics mentioned the problem "Oelstand Motor" (ölstand motor). According to the operation manual, this is severity level 1 problem, and driving should be stopped immediately. Of course, engine oil level or pressure is something to be not taken lightly, so I became a little worried. I checked the oil level, and it appeared to be plenty to me, around one third left.

I browsed the error message on the Internet, and found a German web site that talked about the problem. In many BMW E34 model cars, the oil level indicator is quite sensitive, so I decided I'd just add more fresh oil. I didn't need to add it no more than 1 dl, and the problem went away. Lesson learned: the message "Oelstand Motor" just means that the engine oil level is low. Nothing more serious.