I bet it is simply that your lifters are draining and need to be pumped up with oil. My Boxsters don't do it, but my Mercedes CLK 350 has noisy lifters for a couple of seconds before settling down.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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