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 ...

THIS paper describes the background, operation, and results of a series of 50,000-mile low-duty service tests on motor oils. Comparisons of engine cleanliness and wear are presented in oils ranging ...

DETROIT - In the latest example of Volkswagen of America Inc.'s quality woes, the automaker is warning 426,000 VW Passat and Audi A4 owners of an engine oil sludge problem. Affected are 1.8-liter ...

Learn how a 6.7 powerstroke delete kit with tuner and smart upgrades like a ccv delete 6.7 powerstroke can lower EGTs, prevent intake sludge, and improve diesel engine performance.