Did you buy it? The chrome center caps are cheap dealer items. I suggest taking the car to a body shop to check out the leaking trunk. Remember that in that respect, this car is the same as a 300E. A Mercedes specialist body shop will be able to diagnose that real fast.

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Mark Stetson
1995 E320 Wagon Moonstone Grey/Parchment 106K mi.
2007 E63 AMG Graphite/designo 75K mi