Someone who is obsessed with cars is often referred to as a "car enthusiast" or a "car aficionado." They may also be called a "gearhead," "petrolhead" (used more commonly in British English), or "auto enthusiast." These terms all describe individuals who have a deep passion and intense interest in automobiles, whether it be their design, performance, history, or mechanics. Car enthusiasts often spend a significant amount of time and effort learning about cars, attending car shows, collecting car memorabilia, and sometimes even modifying or restoring vehicles.