Emissions rules, reduced friction, higher operating temperatures and shorter testing cycles: the main factors shortening the life of modern engines.
As automotive technology advances, engines are expected to become more reliable, yet workshop statistics and owner complaints point the other way. The article lists the main reasons modern engines wear faster.
- Modernisation: variable valve timing, turbocharging and direct injection raised performance but made maintenance and repair more complex.
- Reduced friction: smaller bearings, journals and piston pins, plus thinner oils, lowered resistance to overload.
- Higher operating temperature: raised to cut emissions, it accelerates ageing of oil and components.
- Shorter testing: competitive pressure has compressed development and test cycles for new engines.