When I bought my 1985 300D she had been parked for a year in a driveway. It took a couple of minutes to get her started in the mid thirty temps, but she also had two or three glow plugs not working. Once she lit I drove her from Cincinnati to Bryan, OH on the interstate. No issues. She really seemed to 'clear her throat' for about the first 20 minutes of the drive and then she just drove like the glorious W123 that she is. My father was with me to bring our Buick back. He thought that I was crazy in expecting to drive a car that far that had sat for a year.