The kia oil drain is close to the exhaust, but I don't think that oil would be likely to come in contact with the front pipe even if the plug was omitted. The filter is a top-loading cartridge, which is in a crowded spot. Four o-rings have to be replaced as well as the filter. If the top wasn't screwed down tightly, or if an o-ring was omitted or damaged, oil would mist over the top of the engine. A sloppy installer might leak a fair amount of oil as it was lifted out. It's not hard to imagine it finding it's way to a hot manifold or pipe.
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