Oh, one thing I forgot to mention is that when I was looking under the hood yesterday, I noticed that the driverside valve cover looks to have been replaced in the past, as there is NO oil residue whatsoever on that valvecover, whereas there is minor seepage on the back of the passenger side cover. When the chain is replaced, does the driverside valve cover have to be removed? I am wondering if this "newer looking" valvecover gasket may be a sign of a timing chain replacement. It has 263K, so I imagine that it was changed at least once, or it would be rattling like crazy by now?

Here is a photo I took yesterday of that area.

Thanks in advance for any input.

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