Opel Astra 1998 1.8 petrol service and maintenance

Engine oil

Engine oil capacity: 4.3 litres (4.5 quarts)
Oil change interval is 15,000 km or one year, whichever comes first.
Recommended oil type (Oil Viscosity Classification SAE) is 5W-30

Air filter

Air filter change interval is 15,000 km.
After prolonged driving in particularly dusty conditions, it is advisable to check the condition of the air filter earlier and replace it if the filter is visibly dirty.

Fuel filter

Opel Astra 1.8 petrol fuel filter change interval is 60,000 km

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.