Never rely on MB approved used. My ML350 (now sold) had a completed approved used checklist but when I went to collect it the car had quite a few issues such as chip on windscreen in drivers line of sight, 4 buckled wheels, missing load cover, rear nearside passenger door not locking and window mechanism faulty, bonnet front wing and drivers door needed respray due to stone chips and scratches and 2 tyres on wear bars plus some other issues. All fixed by the dealer but it took 4 months to complete. One more thing, when I bought the ML it had an A1 ??? registration but when I picked the car up the reg had been taken off, I should have created a fuss but didn't.