Mostly depends on how often the coolant is changed. Regular coolant has anti corosive properties that last about fourteen months. You won't be able to get all the coolant out when you change it unless you pull the motor. As this is not a practical solution that means it should be changed evey year. If it is changed every year I think it should last longer than ten years. My 1998 has 183 000 (115 000 miles) kilomters and is fine so far. I change the coolant every year.