As somebody who flushed my newly acquired 1.8t about 18 months ago, I would advise not to do it!
Mine dislodged loads of muck and it blocked the strainer within about 2 miles...
Ok, the upshot was that I needed to get the pump and strainer replaced (I stopped driving immediately and the engine was not damaged), but I'd rather not have had to do it!
A good quality oil changed every 5 or 6k will clean the engine out gradually, as well as being generally good for your engine. Oil is cheap nowadays, less than it costs to fill up with fuel!!