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Timing belt isn't a quality issue. All belts will need to be replaced eventually and is just basic maintenance. The issue to replace the timing belt at 100,000 miles is preventative maintenance because unlike other belts, if that belt breaks it can lead to engine damage. Why back then they went with timing belts is because it was better for NVH. But they have since moved to timing chains due to the decrease in maintenance.
I would find out how old the timing belt that is currently on it is. It may not be 100K yet, but it is 20 years old and the rubber may have deteriorated if it is still the original one.
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