The belief is that contaminants and sludge will settle out overnight (and therefore stay in the engine) if you drain it cold.
Your new favorite oil manufacturer recommends changing oil when it's at operating temperature: Castrol oil change
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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