Buying a Certified Pre-Owned MB from a dealer is almost as good as buying a new car. There are different levels of coverage available, so make sure to ask the salesperson for the details. Also, not all systems are covered for the entire warranty. Again, ask the salesperson for an explanation. IMHO, MB CPO buyers can have the peace of mind a factory warranty offers, without the cost of buying new. The downside to CPO is that the dealer usually doesn't have much room to negotiate the price.