Timing Belt on 2000 Audi A4 Quattro

At what point should you have the timing belt replaced ?

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2 answers
the manufacturer recommends repalcement at 52,500 miles for severe service and 105,000 miles for normal service.
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The manual says 105k but you should do it MUCH sooner. If it breaks it goes from 1000 to 3000k repair. Here is a link to maintenance schedule for the A4. https://wiki.bentleypublishers.com/display/tech/Audi+-+2001+Maintenance+Schedules;jsessionid=3B9D96D96E9C2D4E64C1E0CB98A3C4A2