mine dun 118k on a stage 3,then lost oil pressure due to the oil pump drive wearin out,as 4 a rebuild ave a go ur self if ur handy wiv the spanners an know wot ur doing shudnt cost no more 1500-2000 dependin on wot u need. me an my m8 rebuilt mine wiv out any probs,to be honest there a pretty easy engine to work on if u ask me,cant wait to build my nxt 1.