Make sure to clean the flange of the oil pan and the bottom of the engine really, really, really, really, really good before reassembly. Or the rtv/silicon will not do it's job. You may or may not use a gasket. That's up to you. Both ways work fine.
You'll know its clean enough if your willing to put your mouth on it. It wouldn't hurt to just clean the oil pan up inside and out. Then you could even repaint it if you like while it's out.
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