If your car has an oil cooler, it's there to keep the engine oil from getting too hot. Engine oil gets hot when it's working hard, like when you're driving up a long, steep hill. The oil cooler helps to keep the oil from getting too hot and breaking down.
Oil coolers are usually a radiator-like device with an oil-to-water heat exchanger. The engine's oil flows through the heat exchanger, and cooling water from the engine circulates around the other side of the heat exchanger. The water helps to take the heat away from the oil, and then the cooled oil flows back into the engine.
Oil coolers can be a great way to keep your engine oil from breaking down. They can also help to extend the life of your engine, since the oil will last longer when it's not breaking down.
There are a few different types of oil coolers, and they each have their own benefits. Plate-and-fin oil coolers are usually more efficient than tube-and-fin oil coolers, and they're also more resistant to corrosion. Bar-and-plate oil coolers are the most efficient type of oil cooler, but they're also the most expensive.
If you're looking for a way to keep your engine oil from breaking down, an oil cooler may be a good option for you. Talk to your mechanic to see if an oil cooler is right for your car.