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Originally Posted by Eiknujrac
The dealer technician said not to worry about it, and that it was turning very straight with no play. Should I worry about this issue?
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The dealer's tech is BS'ing you. Balancer failures happen at all kinds of mileages, and if you have an early version or if it looks at all like it's coming apart, it MUST be replaced. If not, it can come apart and do THOUSANDS of dollars of damage in the engine bay.
What did the PPI reveal about the shaking? I would not buy the car with that behaviour, or the old balancer. Known failures on the M112 include the balancer (many newer part #'s) and crank position sensors. Also, be careful about service records, since 98 M112's were shipped with dino oil and have the dreaded sludge problem if the FSS is followed AND the engine is not switched to synthetic. While MBUSA has extended the engine warranty to 150K-miles, I wonder how difficult it is to get coverage. You must prove that it's sludging AND you at least changed the oil as per the FSS. Also, I'm not sure if the warranty transfers to new owners.