A small gap with big importance in the performance and health of an engine - here's everything you need to know.

See if any of these scenarios sound familiar: Every morning when you start your car, a small cloud of blue smoke erupts from the tailpipe. Or, even though your engine doesn't leak oil and apparently ...

Most modern gasoline and diesel-powered engines found in the cars and trucks seen on today's roadways rely on the four-cycle-engine principles developed in the late 1800s by Nikolaus Otto, Gottlieb ...