'GG' I'm not going to go head to head with you on this a few others in here have tried to explain it also. Some oil would have found it's way into the cylinders after a long period of time due seepage past the rings (& valve stem seals if the engine was in poor condition) if the block was indeed full of oil (which I might add would be a lot of oil) hence that's what ran out upon plug removal. As I said I'll give you the benefit of the doubt
Oh & btw I don't need to be an armchair expert as I am a qualified motor mech & have several years of A/C engineering under my belt in a previous life.
'aldee' yr quite right fuel does go stale & loses a lot of it's calorific value after time.
Wmk2