There has been at least one reference to the Oil Temperature indication, "almost certainly registering ambient' was I think the statement.
It might just be worth mentioning that the temp sensors that are used in vehicles I.E. a bulb which must be wetted with the coolant will show a reduction in temperature as the coolant runs dry and is not therefore wetting the bulb.
ambient (indicated) temp will then be much less than that which might be being generated in a major bearing, or cylinder head, that is running dry and located some distance from the bulb.
It is illogical to assume that anyone or everyone who drives a modern helicopter has had the experience of driving a water cooled vehicle which has had a hole in the radiator and exhibited this characteristic, or, indeed been briefed of the idea.
Therefore it is logical that, if the temp sensor needs to be wetted with the coolant oil to register the temp inside the xmon in this aircraft, that the crew may have seen a low temp indication and thus been fooled into thinking that indeed there must still be oil there because it is now showing a cooler temperature.
Even the investigators of the voice comments on the CVR may not be aware of this characteristic and if not it may help them understand comments that may seem out of place. Like "look at that, ok, power up".
If that were the case a simultaneous recorded lower oil temp on the data recorder may be the nub of an explanation.
May be?
all the best tet.