Recently bought '05 Passat with about 121k miles at auction. Price was really good. Upon pickup, I realized that the transmission was acting funny. First thing I noticed was that the torque converter wasn't always locking up at high speeds. Later, I noticed that the rear of the car got wet with atf fluid and burning oil smell inside cabin.
Filling these transmissions can be a real hassle as a pump is needed. Also, 17mm allen wrench or hex key is needed to take off the fill plug under the transmission.
With a major leak in front of transmission, i.e. between engine and transmission, I could drive about 250 miles between each fill up. I drove about a 1000 miles this way, to get the car home.