Vulnerabilities in Evo IX.?

Hello, … I’m currently looking for a Lancer Evo 9… Would you like to ask what you should look for with this model, because of rust etc?! Have experienced with Mitsubishi “null” so far, only Mercedes and Opel drove! How long does the engine last so long with the Evo so..? Since it seems to be quite charged! And what about consumption and entertainment, many repetitions necessary..? Already a thick THX for all answers… MfG. Jan