We love our x- trail, for a while we been having problem while towing, car, fine while solo, but when towing I get a bit of smoke, been down to the garage trying to sort it out, no luck, in the end I went to a nissan dealer told them what happen, witin half hour, problem over, it was the garage that service my x-train have been putting in too much oil, causeing it to smoke while towing, been away for the half term and found the problem gone, so you lot with x-trail make sure your oil is not over the dip stick mark, now mine it under it as I keep a eye on it and it don't burn oil, other than that it a lovely motor