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
Manufacturers recommended timing belt replacement interval for Opel Astra 1.8 petrol is 60,000 km.
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.

Opel Astra 1998 Stationwagon 1.8i-16V 2000 - 2004 Opel Astra 1998 technical data
Opel Astra 1998 owner reviews
Always consult your vehicle manufacturer's service manual for service intervals and specifications!