He was inverted a long time wonder if he starved engine for oil?
brave man to save the plane
This video is showing the forced landing from another angle: http://youtu.be/Dx8U3nDRPUs
well the engine is upside down to begin with...
More importantly the DB605 had a dry sump oil system, but still only a few seconds of negative G flight could be made without starving the engine of oil.