I am curious about this too. I am hoping to buy a New-to-me, used Ecoboost. I am wondering if I need to stretch my budget to try to get a newer generation Ecoboost. Most of the trucks in my budget are in the 2012-15 model years. Having just sold a truck that I had to replace the engine in due to Cam Phaser issues, I don't want to make that mistake again. It has been hard to determine if I should wait to buy the newer gen or not. I tend to find mostly positive comments about the Ecoboost engines, but I don't want to fall into "confirmation bias" and miss something.