Back in March at Amelia Island, a Mkl sold for $150k , very strong money for a Mkl. Values going down, I don’t think so. Good cars will command good money. As far as others complaining about overheating, brakes etc; a well sorted car will perform as you would expect any car to, so if your experiencing these minor issues, the car is telling you that you need to work on something. I’ve owned mine now for 34 years, spark plug changes are no big deal.