Audi 4.2V8 cambelt Change Interval

Can anybody confirm the correct cambelt change interval for an Audi
4.2 V8 engine in a 1996 Audi A8?
I have the Bentley CD which shows a routine service interval of 7500
miles and a cambelt change interval of 90000 miles.
My motor mechanic says that his documentation shows a routine service
interval of 10000 miles for this engine, and a cambelt change at 60000
miles.
My Audi dealer unofficially says also a 60000 interval


Which is correct?


Thanks