Picked up this one-owner 2018 Yukon Denali with the 6.2 and 10 spd. with 132k on it last Feb. but it was super clean and well cared for and very "tight". One thing I was unable to determine with CarFAX was to find any record of a tranny service so took it over to the nearby GMC dealer I've done business with for 14 years. Service advisor wildly under-quoted their tranny-flush price by $200 and told me the 10 spd. had an external filter. Once the service was complete and I got done bitching them out for the price mis-quote, they said this vehicle's tranny did NOT have the external, OEM filter on it. No idea if that was added later in the 2018 model year or if the guy had no idea what he was talking about.