Hello moose drivers, have finally found my moose and already a problem. Since yesterday I have an irregular laxing in idle. Today I listened carefully and found that it definitely comes from the area of the valve cover. Thus I tend to assume that it is a defective hydro. Maybe it is only the oil. Because the previous owner probably made the last oil change on 26.06.2010 and let it fill with Shell Helix 0W30 AC n. Now I have an oil change date shortly and ask you if there is the possibility that the clacking is then gone. What oil do you recommend? Below I attach a sound file, in which the clacking can be heard from about 1:06 to 1:10 in the background. In addition, at the end of the file is a beep to be heard, which can be heard when the engine is switched off. This beep comes from the red-marked area on the attached photo. To the beep came shortly after the motor is switched off. What’s that exactly? (Nock wave adjustment?)Soundfile Maybe you can give me some answers. Hope it’s more or less half as bad. Thank you very much for your time.