First post here. I had both 21B10 and 21N08 performed by a dealer in NW NJ last week. Mine is a 2018 XLT Max purchased CPO earlier this year. Had 40k miles at time of service last week, I've since put another 1k miles on. Cam phasers were obnoxiously loud prior to the service. Generally compliant now, though I'm not confident this will be a permanent fix. For the time being I'm glad it was a success.
I should also add I use this for work and have already put 11k miles on since purchasing. Overall very pleased, this is my third Expedition, though my first 4th gen.
I should also add I use this for work and have already put 11k miles on since purchasing. Overall very pleased, this is my third Expedition, though my first 4th gen.