take sound advice from lads here and try and get refunded,get legal representation onboard if possible and just let the veichle at the dealership,remember you only just drove away after the purchase and it blew so you are well within your rights to be refunded!!
a patrol can overheat for any reason,a radiator can go at any given time and leak,remember the coolant is the lifeblood of this engine so it's not only a head you have to worry about it's basicly every other engine component that may have overheated also!!
are they going to inspect everyother engine component with a fine tooth comb? i highly doubt it unless you were lucky enough to be living longside a really large nissan dealership in japan!!
the cylinder head fix on these is just a simple fix,it's a very strong engine so it can get away a lot of times with just a new head,coolant flush and gaskets,this is even an expensive fix but in the ZD30 terms a cheap way out.....IMO the complete engine should undergo inspection and get a fresh turbo fitted also.
a reconditioned engine,if it was me i would want to know who reconed it...... that could be just one out of a used patrol with any amount of miles on it... i wouldn't trust it.
just take sound advice and don't let them botch this one up,it will let you down again! !
RUN!!
-Dan