I walked into the garage the other morning to crank up my 2011 335d and found a large puddle of urea fluid on the garage floor. My first thought was I must have damaged the tank from road debris although I didn't recall hitting any. Off to the dealer where no visible damage was noted. They didn't offer any explanation other than to say they "repaired" the malfunction by replacing the entire tank assembly. This was the second replacement. The tank was replaced three months ago to address a recall of the SCR valve. I was told this valve was in the tank and the only way to change it was to replace the tank. So now the urea tank has been replaced twice. Has anyone else experienced this problem with the urea tank? Love the 425lbs of torque but I'm frankly leery of the potential maintenance bills when the car is no longer under warranty.