Opel Astra 1998 1.8 petrol service and maintenance

Engine oil

Engine oil capacity: 4.3 litres (4.5 quarts)
Recommended oil type (Oil Viscosity Classification SAE) is 5W-30

Timing belt

Based on practical experience, recommended Opel Astra 1.8 timing belt change interval is 60,000 km when belt should be replaced, or at least periodically check the belt's condition after this mileage and replace it at the first sign of damage.
Running your car in aggressive environments (e.g. salt, sand, etc.) causes timing belt to degrade faster and reduces its lifespan; under such conditions, the belt may need to be replaced sooner.

Gearbox service

The maintenance interval (oil change, filter, if any, replacement) for Opel Astra automatic transmission is 60,000 km.
Gearbox oil specification is ATF Dexron III. Partial oil change takes 3.5 litres (3.7 quarts) of oil, while total gearbox oil capacity is 7.2 litres (7.6 quarts).

Gearbox maintenance information is provided for Aisin AW50-40LS gearbox. Before servicing, make sure your car has this particular gearbox.