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I would say to anyone who is using the guide of ten years or 108k miles before changing belts is replace the auxiliary belt earlier, the one that snapped on mine looked very cracked.
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The aux belt replacement schedule is half the cam belt schedule so it's done at every 54K. Thus it gets changed on its own between cam belt changes and also gets changed when the cam belt is changed. Very important as an aux belt failure can derail the cam belt and that can wreck the engine. It's very strange that the aux belt is specified to a lower standard than the cam belt which is really of a very high quality but nevertheless can be undermined by an aux belt failuree.