I was following my wife in her new 87 560sl with 91K miles. After about a hundred miles of fine driving since we bought it, the car was stopped and sat for four hours in about 40 degree weather. Shortly after restarting, and driving and about 45 miles per hour, it started smoking a fair amount from the tailpipe, it smelled like oil, etc. The smoke and smell stopped after maybe 30 seconds. Worrying to me. Too soon to know if it is using oil heavily. Is this a "wait and see" or an "alarm" condition. The car was checked out substantially when I bought it in terms of compression, ensuring smooth idle, etc., but it wasn't tuned up particularly.

Thanks. And happy holidays to all.