This is great. As for the criticism that a lot of the content is old, most of the core concepts can be explained better with older tech as it's simpler. This allows you to focus on what is happening and leave the extra details about what technology a part or process has for a case by case basis. https://www.youtube.com/watch?v=yYAw79386WI is a great example of this.

Saying that, an article on direct injection, common rail diesels, efficient turbo charging, variable valve timing, MAF VS MAP EFI would be worth considering.