UPDATED: Just got my X5 back, much improved. Couldn't diagnose the Transfail safe error.

Great list, mine is in with the dealers with the following:

1. Driver’s seat squeaks each time I get in/out or take a corner or just shift my weight.

BMW DEALER: Removed Seat from Vehicle, strip and lubricate all pivot points.

2. Squeaky Steering turning left to right after car has warmed up for 20-30mins.

BMW DEALER: Add additive to Power steering fluid reference BMW measure for noise from steering.

3. Front drivers and passenger side door rattles/clinks/vibrates when closed

BMW DEALER: Removed trims, lubricate seals and tightened windows regulators.

4. Engine/Turbo provides a single ‘beep’ like a heart rate machine when accelerating hard and turbo engages.

BMW DEALER: Add additive to Auto gearbox reference BMW measure from noise from gearbox

5. Trans. failsafe Prog Warning error message appear intemittently

BMW DEALER: Unable to reproduce problem during test drive. No faults found. Carried out Battery test which failed. Possible cause of error. Recharged battery.

6. Gears do not always engage forward or reverse unless engine is revving around 3500rpm.

BMW DEALER: Unable to reproduce problem during test drive.

I'll post what they've done with the car when I get it back, they've had it for nearly 1 week so I'm hoping it's all resolved.

I've only owned the X for 3 months. After 4 days after ownership the Panoramic Sunroof failed, then a glow plug failed and various other issues occured which a dealer resolved under Warranty. Because I wasn't happy with the overall car, they took it back to give it a proper checkover.