Big miles on any car, nevermind a 4 cylinder, at least it's a naturally aspirated unit. $3500 is the right price, at that price, you forget wasting time and money on PPI, compression checks, etc, you just roll the dice and see how far it'll take you. Putting a bunch of time, effort and money into thoroughly investigating the mechanical condition of a 400K km car isn't wise. Get it cheap enough that you don't have to care, or move on and find something else.