Do we have to put in engine oil?

Yes, engine oil is crucial for the proper functioning and longevity of a car's engine. It lubricates the moving parts, reducing friction and wear, and helps to dissipate the excessive heat generated by the engine. Without engine oil, the engine would quickly overheat and seize, leading to costly repairs or even complete engine failure. Engine oil also cleans the engine by carrying away dirt, debris, and microscopic metal particles, which are then trapped in the oil filter. Regular oil changes, typically every 3,000-5,000 miles, are essential to maintain engine health and performance, as old or dirty oil loses its effectiveness and can lead to increased friction, overheating, and the buildup of harmful deposits[5>.