i have had 2 hatchback,they are only wrx models but 1st one was standard and head gasket went on it so i got rid and said i wouldnt get another,now i have another wrx hatcback lol this is map't to 320bhp and i love it,but as said it is pot luck if you get a bad one,give it regular oil changes and look after it it may never go,then again it may go tommorow,but having said that,the engine could go on any performace car,so i would say if your that worried about it that your thinking of selling it then to me your driving the wrong sort of car,me personnaly i think drive it, enjoy it, if it does go then you build it better.