Shutting down an engine with zero oil quantity
It is quite feasible to have sufficient oil to keep the engine running normally, even though the indicated oil quantity is zero. This applies to more than just Rolls Royce engines. There have been previous instances of engine shutdowns unnecessarily. Of course, zero oil pressure is something different. If the oil filler cap has not been replaced, on some engines, venting can occur to the extent that enough oil will disappear to the extent of zero indicated quantity, but sufficient oil remains for the engine to operate.