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Subaru says the factory-recommended interval is 100,000km or 48 months, whichever comes first. So after nine years the belt should have been replaced twice. Wear depends not only on distance travelled but also time, because rubber deteriorates and wear is accentuated by short-distance driving below normal operating temperatures. There is some tolerance for extending the interval at low kilometres, but Subaru makes no specified allowance for this. You are strongly advised, in the interests of engine durability, to change the belt now. By not doing so you're gambling against a failure, and that's not wise.
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