Thanks for the extra info.
Clavurion.
Interesting to note that Beru suggest applying power to the glow plug to heat it up, as an alternative to warming the engine.
Which raises another note (for the sake of the thread...) - the M57 uses 12v glow plugs but the LCI cars with the M57TU uses 5v glow plugs. Beru note only applying power to the older 12v plugs. They may state this simply because a high current 5v power source is not a common option for most mechanics but it generally means that those of us with the M57TU will be warming the engine before disassembly.