Kynntana (Freedom 38)
I just took a diesel engine class, so I'm no expert in these things, but Google "run away diesel engines." Wikipedia says it's rare, but..."A runaway condition can also result from oil supplied by failure of the oil seals in a turbocharged diesel engine, from overfilling the crankcase with oil, or certain other mechanical problems..." The person who was teaching that class has seen it happen a couple of times and there's nothing you can do to turn the engine off from the key or ignition wire. You need to starve it of air, which is easier said that done. I'd remove the oil. Better to never find out what might happen.