The following uses shall not be permitted in any residential district: motor vehicle repairs of a major nature, including but not limited to auto painting, body work or extensive mechanical repairs. Nothing contained herein shall be deemed to prohibit either emergency repairs or preventive maintenance of a minor nature, such as but not limited to an oil change or tune-up; provided, however, that such preventive maintenance is performed upon the premises by an individual who is an occupant of said premises and that the motor vehicle upon which the emergency repairs and/or preventive maintenance is being performed is registered in the name of the occupant of said premises.