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.

Engine oil turns black from a combination of combustion byproducts, heat oxidation, and detergent additives suspending carbon particles in the fluid. Black oil is not automatically a sign of a problem ...

Engine oil performs several vital functions: it keeps everything lubricated and running smoothly while also preventing corrosion inside the engine block, keeps things somewhat clean, and even helps ...