petp. I have posed that same question to many BMW techs and independant wrenches. They claim the 3 and 5 series are fairly rock solid and possibily that is why they hold their resale value compared to the 7-series. Why the 7-series is such a monster, considering it is BMW's flagship, I haven't a clue. I really enjoy my 91-750, however I must admit, I to question why everything seems to go to hell at 100.000 miles when a Toyota or other cars can go 200-300.000 without major problems. If there really an answer to these questions?