Just bought a 99 E320 4matic wagon, 83,000 miles.I Was driving on snowy roads last night and noticed when stopped in fairly deep unplowed snow the car wont get going again, when i watched the car from to outside i noticed the front tires wont spin while the back do. I tried with the ESP off and same thing. Is this correct? It seems as though the AWD is working while driving, just wont engage to get unstuck. I own a Audi s6 also, and am impressed with the way the 4matic handles in comparison with it, but this doesnt seem normal. Any thoughts?