I bought the 4-matic wagon used at 180,000km and had immediate issues with the transfer case, transmission and drive train generally. The ultimate solution to the AWD problems was to remove the front drive shaft. Once over initial maintenance corrections the car settled down to being very reliable and comfortable transportation. Currently it is over 430,000km and still going. The body is just now beginning to show some rust nineteen years after it was built. What a great car!
Great ride, fast on the highway, comfortable and a great workhorse. Although not recommended I did put a class one hitch on it which has been highly useful. An absolutely bullet-proof engine.
The later 320 models with the bigger engine perform better. The 300's acceleration is leisurely.