The CT6 full-size sedan was refreshed for 2019. This year, which is supposed to be the last, some trim levels are gone, but the remaining ones get extra content. Also, forget about the turbocharged 2.0- and 3.0-litre engines. You can still choose the 3.6-litre V6 producing 335 horsepower or the twin-turbo 4.2-litre V8 rated at 500 or 550 horsepower depending on the trim level. A stand-out feature of the CT6 is Cadillac’s Super Cruise semi-autonomous driving tech.