NHTSA Complaint #11556955 — 2017 AUDI Q7

We purchased a 2017 Q7 with low milage. At around 75k miles the engine started consuming oil every 1,200 miles, when previously it never required an oil change before the regularly scheduled service. The dealer always said "that is 'in spec'". This went on for over a year. Then, when we were driving cross-country for thanksgiving in 2022, the engine made a major concussive noise and we lost power while driving on the freeway at around 70mph. This almost caused a high speed collision. It was winter and we had the entire family in the car. we took it to the dealership, and the service tech recommended a compression test and borescope. No carbon build-up was found. Pressure was 'ok' in all cylinders. There were codes showing a fuel injector misfire, so the dealer recommended replacing all of them. The repair was done, but we've continued to have excessive oil consumption, the engine continues to run rough, and we occasionally get 'drive system malfunction' errors. When driving cross country in sub-freezing winter weather, last week, the engine lost power again. I stopped at the nearest Audi service center two hours later, and the tech found that the spark plugs had significant carbon fouling. Spark plugs were replaced. Engine continues to consume too much oil. Based on my research, it appears that this is a known issue, with several class action lawsuits. The Q7 does not appear to be part of these suits (yet), but there are posts and forums all over the internet with owners reporting this problem.