Oil coolers are essential components in a car's engine, responsible for keeping the oil at optimal temperatures. If an oil cooler isn't working properly, it can lead to some serious problems with your vehicle. It is important to be aware of the signs that could point to a faulty oil cooler so you can take action before any major damage occurs. Common warning signs include louder than normal engine noise due to an increase in operating temperature and higher levels of smoke coming from the exhaust pipe which indicates burning oil. Other symptoms may include visible leaks under the vehicle or around various hoses connected to the radiator, as well as decreased fuel efficiency and sluggish engine performance. If left untreated for too long, these issues could cause permanent damage to your car’s internal system and require expensive repairs or even replacement parts. To avoid such costly fixes, be sure to keep an eye out for any of these classic indicators that something might be wrong with your oil cooler!