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Just a recollection of another post on this forum a while ago. I think there is an oil cooler on the left side of the engine behind the oil filter that tends to leak. There are gaskets that can be changed to fix it if that is where the leak is.

Yep, kind of a dirty brass color on my engine. About the same diameter as the filter, but only sticking out an inch or so.

'89 4Runner, V6, Auto, 180K, Some stuff's stock, some isn't.