A Kia oil pan is a major Engine Parts. They are usually constructed of thin steel and shaped into a deeper section to fully perform its function. It is also where the oil pump is placed. When an engine is not running or at rest, oil pans collects the oil as it flows down from the sides of the crankcase. This is why it is a crucial car parts. In other words, a Kia oil pan is mounted at the bottom of the crankcase and serves as an oil reservoir.