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SUmp plug shouldn't leak there put in strong enough by Renault (I'm sure they use a breakers bar). I'd think it will be the top manifold gasgets have a look down around where the intake manifold goes into the head where you might find some oil. Also check the oil filler cap as oil can leak from there.
Got a clio 1.4 16v with the gearbox selector leaking, surely it cant be normal? its done if for a few years, but recently the black under tray is almost completely covered in oil from here.. so must be getting worse.. whats involved in sorting it/ cost?