I own a 1990 560 sel and have an oil leak. It only leaks when the car is in gear and going at least 40 mph. it does not leak when it sits. It leaks after you are driving it and come to a stop, then you see the smoke come from underneath the car. Could someone tell me where they think it might be coming from. I had the seals replced and that is not it. I was also told that there are two oil pan gaskets an upper which they believe is leaking and the bottom which isn't.