Sorry to dig up an old thread - but having had a look at a few CLKs - I would like to know if you can guide me on deciding on taking a risk with M272 E30 or M272 E35 (As used in CLK280 or CLK350). From the complete M272 thread, I know how to check vin and engine number and there are 3 classes of issue (Balance shaft worn plastic cog, balance shaft solenoid and balance shaft solenoid leak). Issues 1 and 2 are more serious - but I don't really know how to asses the risk of catastrophic failure. As far as I can tell there is no way of knowing from a test drive (other than if the engine management light happens to come on). Specific Qs: - Can a engine management computer be plugged in to see the history or do the codes just get reset? - If it was repaired, what am I looking for in the service book? - What sort of mileage to failures start to happen? --------- I am having to do a lot of remote research before looking at cars in person and want to make sure I am getting the right answers.