My best was a 300SE. Â I did over 300,000 miles in her and she never failed to start. Â When I sold her a couple of years ago, she was still in great condition. Â I now have a S320 and a S400. Â The S320L is great for comfort but is full of problems and feel loose. Â I think due to the previous owner. Â The S400 is a dream at 12 years old and still feel like Mercedes should. Â Quality.