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Oktavia A7 2014 1.6 MPI (CWVA). The engine was equipped with a phase regulator control valve from the factory, number 04E 906 455 N. It did not hold oil well when the engine was turned off, and its screens could break off and fly into the system, causing problems with engine operation. Later, the factory modified this valve and released an updated version with number 04E 906 455 AC. I recommend checking these valves on your engines to prevent problems with oil supply to the phase regulator.