 Our Gl450 has 70000 miles and the transmission locked up on the highway. Thankfully no one rear ended us.The vehicle is at the dealer and Mercedes is refusing to goodwill the transmission. The car has always been serviced by Mercedes. Cost to fix $8300.00. In addition we have had 3 aircompressors go out, cam plugs leak oil, power steering pump replaced and the window trim paint peel off.When you buy Mercedes you expect quality and service, we have had neither. This is our second Mercedes with problems.We have have had BMW's and they very reliable. We will not buy another Mercedes.