 My 2007 Mercedes Benz C280 4matic was the worst financial decision I have ever made and will never own another.  The car has just under a100,000 miles and I've put over $5,000 in repairs. A few days ago the check engine light came on so once again back to the dealership. The called with a repair estimate for $6,000. Really?  I declined the repairs and will be buying a new car today. I doubt if I will get much for trade in given the repair expenses.   So it's been an expensive car to own and no resale value.  And it didn't even reach 100,000 miles