The internal combustion engines that power our cars rely on an extensive series of interconnected parts, mechanical systems, and electronics to send us down the road. Some of those components are well ...

But does this tech actually do anything? Obviously, an idling engine uses fuel, while an engine that’s off does not. But restarting that engine does use fuel. So which one has more of an impact? Well ...

Among diesel technicians, a few engines have earned a reputation for turning routine jobs into all-day battles, with cramped packaging, fragile components and baffling design choices that punish ...