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 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.

Knowing what company manufactures specific parts of your car can be tough, especially if you don't have easy access to the information. When it comes to semi-trucks and other heavy-duty vehicles, ...