The lower the bottom number (0W, 5W) the better the oil flows at start up.
I believe this is the latest TSB from Porsche:
http://www.wrightune.co.uk/downloads/approved_oils.pdf
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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