I have not ruled out the possibility of an exhaust leak. I see nothing, but the valve noise is on both sides and pretty balanced.

But it could be normal maybe? Anyone have some audio of a 560 running?

I did remove the valve cover tonight for inspection and all looked well. What I think is normal scoring of the lobes. I will post pics.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car