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Could be a seal as stated above or just about any gasket in upper engine. As mentioned, valve cover gasket is a good start, but could in theory be any upper or intermediate gasket from oil chamber to outside of engine of engine (lower gasket would leak all the time). Ip gasket could do it too...

As mentioned in other oil leak thread (on this page today) check to be sure oil leak isn't actually fuel dripping down dirty engine.