My Car is a 1994 E320. I'm not sure if it was steam or smoke but it continued for over 15 minutes after I turned off the car. However I didn't smell the oil burning but I do have a little leak in the head gasket. I replaced my water pump 8 months ago. It use to run very well until yesterday. I checked my oil and water level. None of them is low. Even the head gasket leak doesn't leak a lot of oil. It's usually one quart low when I change my oil every 2 months or 2000 miles. And it never gave me any clue of burning oil.