Why does the engine oil light come on at idle but goes off when revving?

[DelIsabelle]

If the engine oil light comes on at idle but goes off when revving, it is most likely due to a malfunctioning oil pump. The oil light, also known as the oil pressure light, illuminates when the oil pressure is insufficient. If the oil light comes on at idle, you should promptly turn off the engine and avoid driving the car. Here is more information about the oil pump: 1. Function of the oil pump: The oil pump is driven by the crankshaft via a belt or gear. When the engine starts, the oil pump begins working. It is responsible for pumping oil from the oil pan through the oil passages to the camshaft and other components, ensuring sufficient lubrication during high-speed operation. 2. Types: There are two types of oil pumps—rotor pumps and gear pumps—which can provide approximately 300kPa of pressure at idle. If the oil pressure is too low, some components may not receive adequate lubrication, leading to increased wear.