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Read the FSM yourself and confirm. I am only telling you what it is on average and what Gates recommend. But it seems you spend more time arguing with people then giving out helpful information

That is from those companies. Holden astra is 60,000km. Some cars are 120,000 or 150,000 but rule of thumb is 4 years/100,000km

100,000kms or 4 years, which ever comes first

To go with the timing belt & water pump, i would encourage changing:

- Fuel filter
- Thermostat & o-ring
- Gearbox/transmission fluid
- Brake fluid
- P/S oil
- Rocker cover gasket
- Dizzy...