Walk into any parts store and you'll see the rows of glossy bottles promising to stop engine wear, boost fuel economy, and make your old clunker run like it just rolled out of the factory. The auto ...

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

Drivers reach for gas additives with the hope of squeezing more life, efficiency, or power out of an engine. The pitch sounds simple: pour in a small bottle, drive, and let chemistry work things out.

We may receive a commission on purchases made from links. There are dozens of things vehicle owners can do for engine care. But for many, extending an engine's life can entail more than just proper ...

Every auto parts store in America has a wall of engine and transmission additives that, no matter what's actually in them, promises to fix or rebuild some component or system that needs actual, ...