Duramax bites the dust - Blown head gasket @ 102K miles

Personally I would say it has hydraulic locked. I would have it towed to someone that is competent at diesel diagnostics and have them check it out. They will need to pull the injectors and see if she spins over. Head gaskets and a good engine and cooling system flush to get rid of the coolant and oil contamination may be all you need. Just make sure you have them do a complete compression check on it to see if anything else was leaking. They should also check the heads for cracks and warped heads.
Good luck.