I'm in DUB at the moment -- came over yesterday on the 11:30 FR209 from STN, a -200. I was sitting behind the right-hand engine, and it was leaking what looked very much like oil from various seams in the rear cowling. I noticed this around half an hour into the flight, told one of the stews (as discreetly as possible), and was told by her after we landed that the pilot said it was just excess fuel (!) and nothing to be worried about.
Which, frankly, I don't believe - I haven't got huge experience of aviation fuel, but I don't think it's brown and viscous, and I don't believe it normally bubbles and seeps out of the back of the engines. I waited for a bit in my seat after landing; a young chap wandered over to the engine and looked at it for all of five seconds before lolloping off, but I've no idea whether that was connected.
I'm going back tomorrow (FR228 at 16:25), but I'm feeling somewhat more apprehensive than normal...
R