The term 'OLD CAR FEATURE' can be broken down into two crossword solutions: 'Chrome' (6 letters) and 'FIN' (3 letters). Chrome is a type of metal that is often used to make car parts, such as bumpers and trim. It is known for its shiny, reflective surface. A FIN is a feature found on the back of some cars, usually near the tail lights. It is a vertical extension that is often used for decoration or aerodynamics.