Holden Astra 2004: What is the service interval for the timing belt?

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My wife's 2004 TS Holden Astra has done 60,000 km. The service book suggests the timing belt be replaced at 90,000 km, but Ultratune suggest 60,000 km for this model, and Holden weren't positive either way. What would you recommend?

Change it. Holden reduced the service interval on the Astra timing belt because of a raft of failures of the belt and tensioner. The history of failure on this model, and the potential consequences of not changing it are too dire to risk.

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