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timing belt change interval

In message <l03110701aff29fa0fe1a@[]> Phil and Judy Rose writes:

> How do Audi enthusiasts react to this (timing belt) philosophy:
> "Inspect first--replace only if visibly deteriorated."? (*)

Only Superman has X-ray vision.  Besides, engines have a tendency to stop 
rotating in the same place each time, and that part of the belt tends to sit 
in a curve under tension through a hot-cold cycle, and is then asked to flex 
again the next day.  Inspect it by all means, but set an absolute upper limit 
of 50k miles (my personal opinion - my own ur-quattro sees a new belt a little 
more frequently, and the Coupe GT will not see another).

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club

 (Anyone got a use for a 19mm Allen driver?)