I would say the quick answer is NO. I was told to not use 5W anything in a Boxster.
My guess is you haven't read this:
http://www.lnengineering.com/oil.html
I would not use 0W40 period, let alone Mobil 1.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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