Having had 2 cambelts snap - the first on a Peugeot XUD 1.7, 25K past the change milage (I plead ignorance - my previous car was a Cavalier, and the timing CHAIN lasted its whole 199,000 mile life) the second was a dealer-maintained-from-new AudiA4 TDi, cambelt snapped a few hundred miles short of the specified 60,000 mile interval, at 179600. When I checked the service record, it had previously been changed early, at 119,500. Both cars went to over 250,000 miles after a replacement, 2nd hand head was fitted complete. As said, tensioners are often the cause of belt failure. I know changing the belts on a KV6 is a pain, and expensive at a garage, but not changing them and tensioners could be a very expensive false economy.
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