discovery overheated and siezed

hi guys and girls, my mate has just ran dry a 300 tdi discovery on the motorway,after cooling it will turn over but will not start and wants to know if the engine will go again or scrap it.its done 130 000 and needs to know if maybe it needs new head=gasket any help would be much appreaciated.
budgie

Depends what went bang before he had the intelligence to switch the engine off. He'll need to take the head off whatever happens in order to check for warping or HGF.