We have a 2014 with 90,000 miles. Took it to the dealership for blowing white thick smoke out of the tailpipe. Dealer is telling us that the entire engine needs to be replaced because of sludge build-up. They are trying to say it is from lack of maintenance. We have owned the car 18 months. The car was JUST at the dealership 2 months ago when they replaced the transmission. We didn't even have any problems, just told us we were getting a new transmission. The dealer changed the oil at that time. How was there not a problem detected then?? I am so confused as to how a 3 year old high end car can need a new transmission and a new engine?? I love this car and would love to hear from other owners.