I have a 99 ML 430. Today, with 65K on the clock, a loud rhythmic sound came from the engine. Increased with speed. Opened the hood and saw the harmonic balancer about to separate from itself. Drove slowly to dealer where it was confirmed. Because of this forum I inquired about a good-will repair which I was assured would be strongly considered. The dealer has seen this quite often and made the diagnosis within a minute of opening the hood. I inquired if the new parts were modified to be improved.... they said yes.