The problem is that squeezing out more fuel economy + power and reducing emissions has also made the engine design more complex. Not too big a leap to say this

The problem is that squeezing out more fuel economy + power and reducing emissions has also made the engine design more complex. Not too big a leap to say this also makes them less reliable and more difficult to service. There's a video going over the new and old designs (pinned to where the 4cyl part starts): https://youtu.be/ei5yC4IdDhs https://youtu.be/ei5yC4IdDhs Wouldn't be too surprised if they retire it next year.