If you're curious, the oil pan is located at the bottom of the car and is attached to the bottom of the engine. The oil pan serves as the primary reservoir and storage space for all your car's motor oil. Here, an oil pump is mounted to pump oil from the oil pan and circulate it throughout the engine. But before that, the motor oil needs to first go through an oil filter, where dirt, debris, and other impurities are filtered out. Once the oil's made its full round-trip around the engine, it'll flow back into the oil pan. Here, the placement of the oil pan - a large exposed tank underneath your car - makes it so that passing air that rushes under your car while you're driving can easily cool down the now-hot engine oil.