Things I've seen that I'd class a common faults:-
Bad solder joints on the right of the dash top, (abs, mil, oil)
Crank pulley
Boot rubbers
Window mechanism
Late second turbo issues
Slight misfire at idle
Front crank oil seal
Things that are age related faults:-
Coil pack clips
Solid/split cam cover hoses, (under cam cover)
Yellow'd, and/or leaking headlights
Rust at the door bottoms due to poorly fitted skirts
Valve stem oil seals
Blocked/leaking heater matrix
Rear drop links causing suspension knocks (generally at low speed)
That's all I can think of at the moment.
I have to say, I've never heard of a fuel filler cap breaking off:blink:
IMO aerial problams are mostly down to bent/damaged masts.