jonboxall said:also when parking up i noticed the steering was really groaning and whining quite loudly, which was worrying..
If you mean what I think you mean, this is normal.
Unlike the standard Z4s, the M has hydrolic steering which makes a metallic-hissing noise as it touches the limit of it's turning circle. Not to be mistaken for a metal creaking noise mid-rotation which could perhaps mean it has seen some hard days.