Extended warranty

I have a 2011 M3, 22,000 miles and have one year left on the factory warranty. No track, daily driver, put about 7,000 miles per year in the car. Was at dealer for service and they want $3600 for a 7/70000 extended warranty. The power train plus. What do you guys think about extended warranties? My inly concern is the engine. I'm going long with the car.



Thanks.