Opel Astra Classic 1.4, 2006 year, mileage 70,000 km. I have it serviced at the official dealership every 10,000 km. After the last maintenance, I drove only 3,300 km and topped up 1.4 liters of oil. No leaks. Oil is synthetic, gasoline is premium. Has anyone encountered this? What could be the reason?
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