A well-maintained turbo can last as long as the engine it's fitted to. Most turbos that fail early are killed by something preventable: oil, dirt, heat or a fault elsewhere on the engine . Here's how ...

Common-rail injectors are built to tolerances of a few thousandths of a millimeter and work at over 1,500 bar. They don't usually wear out from age. They're killed by what's in the fuel : water, dirt,...