It was probably a big SEL with air levelling suspension. Can be serious $$$$s to fix if not looked after properly. They're pretty easy to work on, most things are modular and pull off/put on. I've had no issues with Benzes downunder, have a BMW trained mechanic in the Blue Mountains who looks after them. Mobil 1 oil and they purr like kittens. I usually buy one 10-12 years old that has depreciated to 10% of original sticker price with less than 100,000km (60,000 miles) and a good service history. Latest is a CLK500 which I took for a drive on Friday and enjoyed every minute of it.