Just purchased this 2007 odyssey and discovered a small leak. thinking it is a rear valve cover based on the location of the leak. Top rear driver side of the engine. Is this a plausible diagnosis???
At this age you do likely need valve cover gaskets if never performed.
That is a big job. They may be leaking, but may not be. More likely, ....
It could also be the rear spool valve as shown in these videos.
This job is easier. I would start here.
Note the second video @ 2:30, there are two gaskets to change while valve out.
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