I have a 2016, I’ve had a good handful of problems but nothing significant, not like my 2000 M5, 98 Boxster, 2003 Cayenne Turbo. All of which were service nightmare’s, but tons of fun. PS as far as the V8’s go The M278 I had in my 2013 CLS 550 had plenty of issues, including timing chain problems, transmission failure etc.
This is a fairly expensive lane to play in compared to the models you’ve shared. Be aware and plan accordingly.
Plastic lines become brittle and leak, coils need to be replaced often, oil leaks happen. Beyond that get an excellent scan tool and you should be fine.
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