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i have a similar issue on my 3.4L, and had the same thing on my 2.5L. i have developed a theory.........
the boxster actually has an oil pressure regulator that is dependent upon temperature, of all things. it consits of a spring and piston that install into the oil pump under the car. the design is supposed to DRAMATICALLY increase oil pressure on cold start (100+ psi) and then back it off to around 20psi at idle when warm. my theory is that these actually go bad pretty quickly. the result is that it backs of the oil pressure at idle too much and can't keep the lifters pumped up.
i plan to replace mine at the next oil change interval. it's like $35 worth of parts. i'll try to post a pic later; my PC here won't let 'print screen' do its thing.
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