Some drivers may not be aware of the fact that having less oil can affect the engine and make it more likely for metal pieces to rub together, creating friction that can be damaging. The oil's main job is to lubricate the engine and keep it from overheating, making it crucial to keep it changed regularly. However, drastic changes won't occur going over a hundred miles or waiting an extra month; waiting too long after that will take its toll. Nevertheless, an oil change can offer noticeable benefits and improve your Toyota's gas mileage! As the new oil flows through the engine, the lubrication of the metal parts will increase the overall performance, helping it run efficiently with less work. Not cleaning oil will prevent other parts from wearing down is also essential since they do not have to perform as hard.