I know this is an old thread but I was thinking if BMW decided to stop ringing the neck of the 3.0d (40d) and made a diesel variant on the 4.4 V8 as they have with the 3.0i, based on litre per Kw it would develop around 330Kw & 880Nm you would nearly think it would be a sufficent line for the X5s 3.0d & 4.4d and possibly the 4.4M(petrol). I might bring it up at the next meeting