Hi,
The valve covers are nothing more than a cover at the top of the cylinder heads. They can leak and as a result, normally the valve cover gaskets are replaced. They are really not a mechanical component. They are simply a cover.
I attached a pic below from my manual, there are two of them, one on each side. Actually, the manual refers to them as a cylinder head cover. LOL
As long as it runs well, this isn't a red flag. Chances are they started to leak.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Sunday, August 28th, 2022 AT 9:17 PM