So which is the most reliable: Jeep’s new hurricane twin turbo Inline 6, GM’s 5.3/6.2 V8 that I know have cylinder deactivation, or Ford’s Ecoboost turbo V6? I’ve heard in-line six’s can be reliable but not sure about adding the turbos. GM V8s I’ve heard negative and positive things regarding reliability and the Ecoboost I haven’t heard much good about. This is just a question out of curiosity and wanting to hear others opinions.
Personally, I wouldn't buy any of those vehicles. Over time. They all wear out and have expensive repairs, but in the short run probably the GM would be the best of the worst
You left out the correct answer, which is the GM 3.0L Duramax, which is available in the Suburban and Yukon. It has its faults, for sure, and diesel is not everyone’s cup of tea. It also has only been out 5 years. So long term reliability is still TBD. But so far it is building a good reputation. (Full disclosure, I have it in a Sierra. 55,000 miles so far with no trouble).
But of course the real correct answer is: whichever one you maintain properly. And by properly, I mean actual properly. Change the oil every 5000 miles, not just whenever the message pops up on the dashboard telling you to change the oil, which is usually way too long. Whatever the manual or computer tells you is the absolute minimum service schedule for only the ideal driving conditions. The people who have had the most trouble with all these engines are the ones who want to just drive it and not take care of it. But all of those engines have happy owners who were compulsive about service.
You also left out the Sequoia, for obvious reasons, but depending on how that shakes out, that could be a good choice, and you might be able to get one at a discount