This is from my vehicle manual, which came with the car.
All engines consume oil as part of their normal operation, therefore, the engine oil level must be checked regularly, for example when refuelling. Always check the oil before a long journey. The amount of oil consumed depends on how the vehicle is driven and the climatic and road conditions encountered. The rate of oil consumption can be up to 1 litre per 1,000 km/625 miles. Consumption is likely to be higher when the engine is new.