CONSULTATION

Someone could help me I have Renault Megane and brings a noise when it heats up in the engine is a whistle if I get the oil bayonet a little it takes off or if the tape of the aim lid upstalls uncovers. Just the whistle is removed only that here it shows and feels as it makes the engine empty because it even sounds at the time of lifting the plug of the aim cover. Does anyone know because ???? Thanks for your help.