Ex up, read the post! It does not say No engine oil....it says no indicated oil. Just like you don't have full engine oil if you dip your car when it is running....much of the oil is elsewhere. total system capacity 78.2 imp pints.....oil tank (where the indication would be measured) 41 imperial pints. The Trent is certified to operate in the cruise at full thrust for several hours in this minimal oil configuration.
Td...I mentioned one of the uncontained failures in the original post. There is a history of Trent oil loss...some are dramatic.....in most cases the flight continues. What I am looking for is rate of oil loss from someone who has experienced this...or an incident reference.