The 2018 rocker-arm concern — revised for 2019

The one model-specific mechanical item is a rocker-arm issue on early 2018 cars; Audi revised the part, and 2019+ VINs (and later-build 2018s) use the updated arms. Owners with affected-era cars report high-mileage trouble-free running and consider the concern overblown — but it's still worth confirming build date / revised parts on a 2018.