Well BenzMac, every machine shop will "say" they can. In your expertise, how would you choose? I'm not sure what " blowing a valve" means, and I've been in the machine shop business for a long time. If you are referring to the head of the valve parting company with the valve stem, that is not likely to happen because of mileage. If you are referring to burning the valve, that is also not mileage related. If you do replace parts, I would buy the valves from MBZ, not the aftermarket. I've noticed many people in the Mercedes Benz community, have misconceptions about what the terms OE, OEM, etc, actually mean.