Peugeot 3008 Engine Leaks Oil at 140k Km Despite Regular Maintenance

Hello, my vehicle is a 2019 model Peugeot 3008. The car has only 140,000 km on it and is already leaking oil from the engine. I first took it to a private service for a timing belt replacement, and they reported the oil leak. The repair list includes the rocker cover, camshaft kit, seals, and gaskets, with the total cost being nearly half the price of a new engine. I have maintained the vehicle regularly and never missed a service, making this issue even more frustrating. What I don't understand is how such issues arise in a 1.5 Diesel new-generation engine before reaching 150,000 km. This indicates that the problem is likely a chronic defect. Moreover, Peugeot vehicles are among the most expensive. Samet A**** 0546******54.