Engine oil color reveals its age, contamination level, and operating condition. Fresh oil is amber or light brown. Oil darkened to black but still translucent after a few thousand miles is normal.

Everything, even the smallest of things, can affect the performance of your engine. Whether topping off your fuel tank or driving on motor oil past its expiration date, you're slowly killing your car.

As a critical means of lubricating engine parts and preventing overheating, oil is an indispensable mixture. Since it's so important, some might even wonder if an an oil change improve engine ...