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Oil had been leaking from under the valve cover for a long time. But when it was time to replace the high-voltage wires, it turned out that the spark plugs were not floating, but in oil. I removed the valve cover and it turned out that its gasket had simply hardened and could no longer hold the oil. The video shows replacing the gasket with nuances. I had to wash the valve cover in the bathroom under running water. A lot of oily dirt washed out. I replaced: high-voltage wires, spark plugs, valve cover gasket. The 1.6 petrol engine is an old good Opel one - it is installed in Daewoo and Chevrolet (Lacetti and Aveo) cars.