A work colleague has got a mid 90s BMW 520 that shakes/vibrates between 50 and 70 mph. It's got progressively worse and has everyone totally baffled because it is not responding to any of the normal treatments for such things. It's bad enough to make her dog and other passengers vomit, seemingly.
So far, it's had about £800 spent to no avail.
1/ All wheels and tyres replaced and sent to a specialist for balancing. 2/ Propshaft sent to a specialist for balancing. 3/ Put on a rolling road and shake observed on passenger side rear wheel. Wheel re-checked (fine) then suspension components replaced on that side. 4/ There's nothing obviously wrong with suspension.We thought the office 'Banger Expert' would spot the problem during a test drive but he came back looking utterly dumbfounded (really bad news as 'name your fault' and he's owned/driven a car with it!). He could only suggest a bush somewhere that looked and felt fine on inspection but wasn't perfect at motorway speeds.
The only thing I could find on the Internet was that one of the discs might be out of balance and that only BMW supply balanced discs??
Personally, as an Alfa driver, I know little about BMWs but if any kind soul can put this poor woman out of her complete misery with any ideas on a solution to this problem, we'll BOTH be very grateful!!!