LOL ok maybe not
my uncle's owned about 14 beemers so far never had any problems except for a e36 323i which did end up costing him thousands but that was a lemon to begin with.
obviously dealers are gonna screw you up if you want the service history but he's only asking about a cheap 5 series not a fkn M5 so who cares about documents you're gonna lose on resale with the skyline too...
yeah true alot more parts to break etc but they're not THAT expensive and wont break everyday. i'd be more worried about the big stuff engine gearbox etc which from what i've been told and read they do last.
its pointless asking here really if you wanna know about the car go read about it on BMW forums, test drive both then make up your own mind. you're obviously asking here coz you wanna be told to get the skyline..