On my '97 E300, this afternoon on my way back from a long trip to the south, my engine (powertrain) stated making this wierd whine noise when the vehicle was completely stopped and in any gear. I noticed it by waiting at a stop light in NY and I hear this odd loud whine, like a power steering pump being strained is the best I can explain. When letting off the brake and letting the car cost, say 2mph the noise fades out and everything is back to normal. Only when the car is at a total stop and in any gear, except neutral or park. My belts appear to be tight and not loose. Can it be an engine mount(s)? With the hood open and another person applying their foot on the brake and shifting into gear and out of gear there appears to be some decent engine movement, just by quickly guessing the engine shifted to the right about 1-1.5 inches? That seems like a lot and why I am thinking it is the engine mounts. My car now has 167,500 or so miles on it and no idea if the original mounts were ever changed...

Any ideas guys?

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'97 E300
'99 E300