An article published in autoexpress uk reported that German made cars score low in term of engine failure study. German cars known for its high tech and innovative design among the lowest in term of engine reliability. This are what are they necessary to fix. In other hand, Japanese maker Honda Motor scores 1st place followed by Toyota Motor. Mercedes is on third place, one and only German in top 5.
German engine is too high tech so it requires stringent quality control before can be released for production. TSi engine for instant, high compression by combining supercharger and turbocharger in internal combustion system require highly precision and hardened engine parts. Any manufacturing will result in engine failure due to highly complicated mechanical system.
Source: autoexpress uk