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YotaFun and Bighead are actually both right. The story is that when Toyota first came out with the 5VZ, the timing belt durability was such that it required a conservative change interval of 60k miles and thus that was what was recommended in the maintenance schedule. As technology for the belts improved, the recommended mileage was extended to 90k miles. Thus if you change your timing belt today, you can now safely use the 90k mile interval (unless your vehicle was made between 96-98 and you are still on your first timing belt somehow or it was changed duing that period).
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