Another engine dead for Mclaren, or a mgu-h/mgu-k, something. Useless car, team screwed this up so badly this year. GOing to hurt them next year as well. I will never know why they didn't plan to give Honda a full 2.5-3 year development cycle and just use Merc engine for another year if not two.
Ron Dennis' stupid pride, that's what. As soon as Mercedes became a full team, McLaren were relegated to a customer for engines and Ron couldn't bear that.