I have a 99 ML430 and it has this whining noise coming from the engine. It sounds more from the belt area. It has a one year powertrain warranty on it so tell me what you think it maybe.
It could be a number of things such as belt tensioner pulley, alternator bearings, harmonic balancer (though unlikely since it will also vibrate) or air conditioner pulley/clutch. See if you can pin down exactly where the noise is coming from. I would seriously look at the belt tensioner pulley since it has been a problem.
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