Engine oil turns black from a combination of combustion byproducts, heat oxidation, and detergent additives suspending carbon ...

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 ...

It's a common misconception that engine oil being dark is a sign that it needs to be changed, but in reality, this is usually more of an indication that the oil is doing what it's supposed to be doing ...