From what I have read over the years the early model ML's, including the 1998 model year had many problems. I wouldn't even consider buying a 1998 ML320, especially one with 241,000 miles. If you're still interested I would want to see complete service records so you can see what maintenance has been performed since the vehicle was new. Without a complete service history I would not want that particular vehicle, even if the owner was giving it away.

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Fred Hoelzle