Yeah, What YPJT said.
Totally agree, the plane would be dripping oil with the onset of oil consumption like that, for seemingly no apparent reason. From 9.5 to less than two in a couple of hours does not compute.
There is clearly a difference in the damage patterns between a piston deciding to get out because of oil starvation, and the oil getting out in the event of a major component failure. the causes of each are very easy tell which is which, so if pilot is not guilty it will be forensically evident in the failure history of the components, and he will be vindicated, so no need for the nasty remarks from navitimer.
HD