2003 BMW 530i Q&A
We need more info. What area do you see the leak? You need to take it to a repair shop and ask them to diagnose it. They might need to degrease the engine if it's soaked in oil already. Make sure the oil level is correct, otherwise you can damage the engine. Zee - ZeeTech
Valve cover gasket leaks are common after 60,000 miles. Symptoms will include oil drips under the vehicle and burning oil smell from the engine compartment.
Am engine oil leak may develop from the valve cover gasket. This commonly occurs on vehicles with over 60,000 miles. Replacement of the leaking gasket should correct this concern.