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A 728i? Where do you live? That car has never been available in the US.
In any event, a 2.8 liter BMW engine has a cam chain. If the oil is changed regularly, that chain and the guides should last at least a quarter million miles. The VANOS may not last that long, but cam chains are not a high failure item.
You might have a problem with your silencer. Please check the pipeline to ensure there is no hole in it. You also need to ensure your fuel is of good quality and not contaminated. If the silencer/exhaust pipe is displaced or dislocated, it needs to be replaced/fixed .
The thermostat and water pump are both common failure points on BMW 6-cyl engines of this era.
I would recommend checking the thermostat first, then moving on to the water pump.
If the vehicle has overheated several times, you may need to remove the cylinder head and have it checked for warp.
When the car is stationary. Push down on the back (Boot or TRunk) as hard as you can a few times & listen for the squeek. It's more common in the rear suspension from my experience. It sounds like the bushings are gone or worn at the top of the suspension struts.
That's if it does squeek. You might not need your suspension replaced just the bushings as they are normally plastic.
Try doing the same by pushing down at the front of the car also as it maybe happening there too.