HOW DO WE KNOW IF THE ENGINE OIL IS DROPPED?
It is necessary to analyze the oil physically and chemically under laboratory conditions in order to understand for sure whether the engine oil is not suitable.
When you think of an oil leak, this may be what first comes to mind. A dark puddle of fluid dripping from under your vehicle's engine is a common sign of an oil leak. Loud Noise and Knocking - Clean oil provides a thin barrier between engine parts and protects against metal-on-metal contact. When the oil starts to break down, it loses its effectiveness in lubricating so you will start to hear louder noises coming from the engine, such as knocking, rumbling, and even roaring.