whats the full lifespan of a Subaru impreza wrx sti '05
As long as you put money into it and maintain it, it will last. On avg. cars last around 200K miles with good maintenance.
200K + is entirely possible but you will probably end up making a few repairs along the way especially since this is a WRX which tend to be abused by the young punks. I would be very careful buying a 12 year old WRX.
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