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 ...

When it comes to car maintenance, it can be easy to overlook oil inspection even when you have the best intentions. At a glance, oil checks might seem minor, but skipping out on this process can end ...