Are you referring to the soft balancer? If so, you need the engine serial number.
All of the 06's and 07's are affected and part of the 08's are as well, none of the 09's are.
When you settle on a vehicle and if it happens to be an 08, call a MB dealer and ask them to check OR post the VIN here and Konigstiger usually responds.
If so, you have a 5 to 10% chance of having a problem, the repair cost varies but it is a dealer repair and ranges from $4 to $6k . MB helps sometimes but there is no recipe for their participation, it used to be that past 60k you'll be in the clear but I've seen some with higher mileage lately with the problem.
The 09 is the best of the bunch, if you opt for the 4matic, you avoid the 7 speed valve body conductor plate issue.
The e500 is beloved by its masters but you'll inherit the airmatic problems, this is emerging as a prevelant money pit. Arnott has some aftermarket options for parts but its still pricey.
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