Your same fault happened to me on a landrover diesel with failing rings and old injection pump of unknown origin. I fuelled up with a special diesel that had lots of biodiesel in it, to cleanup that old unit. Same experience as yours, but I was able to shutdown mine with the key.
I had badly...
I wasn't there, but what color was the smoke? Black smelling like diesel or light grey smelling like engine oil?? It might be more likely that you had an injection pump failure rather than a real engine oil runaway. It seems there are several gaps in the past maintenance here though.
You had...
something really isn't right. I've heard of the same old bad fuel causing runaway in the past from mechanics. That one doesn't make much sense to me, aside from really damaging the pump and injectors.
The ring failure seems more likely, and the chance that you'll get out of this one with only a...