It's almost a joke, but unfortunately as soon as my 2016 Ford Explorer Sport, 3.5L EcoBoost hit 100K miles (odometer = 104296.9), it "fell apart". First the seal of the PCU (trasnfer case) dried out and ate itself. At the same time that was being replaced, one turbo was bad. Within 2 weeks of getting it back from the shop the second turbo went out. Within 1 month of that the engine went. I don't have an answer what happened to the engine, but I thought the turbo went out again, it sounded like a penny in the dryer. I immediately drove it to the Ford dealer. They pull the valve cover and discovered some "scoring". Then they pulled the oil filter, cut it open, and found metal parts, including brass shards(?). So, if you're going to extend the warranty...I'd make it longer than 100K. Up until then I had minimal issues. I sold it with a broken engine for about 1/4 what it was worth on KBB and that's it for my Ruby. I spoke with another friend who stated almost the same thing happened to them last year. I'm gonna try another company because engines going at 100K should be a joke...not the standard.