Additives represent 15 to 20 percent of a gallon of oil with the balance being high-quality base oil. Additive packages play a key role in helping to keep an engine clean and protected from varnish ...

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 ...

The oil inside your car's engine can sludge up with neglect and infrequent oil changes. Sludge is a nasty contaminant that can destroy an engine if not given attention, but timely oil changes are a ...