I felt the same as you.
But when I asked Jake Raby the same question, his answer was "use something that has a good detergency pack, it'll do the best job of flushing the polymers and etc from the previous oil."
http://986forum.com/forums/showthread.php?t=26538&highlight=valvoline
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2001 Boxster, 5 spd, Seal Grey
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