It's a long shot but still giving it a try. All I remember about this movie which I saw as a child is that there's was an alien robot who did not want to return to the spaceship and drove away with a woman in a car. When the robot left the car, there were some rivets and bolts left on the car seat as the robot was either hurt or something as he was losing its parts.
Edited to add: - Movie is most likely black and white (watched it on a B/W TV as a child in 80's) - Based on production as I can remember, it must be 50's or 60's movie - Sadly I can only vividly remember that particular scene, a human looking robot was shot and was not actually bleeding but was losing bolts, a woman was driving him in a car to a sea-shoreline, to catch a space ship? Once he stood up from the car seat, few bolts were left on the seat