Factory fill is Mobil 1 Synthetic 0W40 European car formula. You'll need to look in the owner's manual for capacity and change volume.
Mobil 1
Porsche OEM anti-freeze part no. 000.043.203.78 available at your local Porsche dealer
The 2004 Porsche Boxster has double overhead cam (DOHC).
The 2003 Porsche Boxster has double overhead cam (DOHC).
The 2013 Porsche Boxster has double overhead cam (DOHC).
The 2002 Porsche Boxster has double overhead cam (DOHC).
The 2006 Porsche Boxster has double overhead cam (DOHC).
The 2014 Porsche Boxster has double overhead cam (DOHC).
The 2009 Porsche Boxster has double overhead cam (DOHC).
The 2010 Porsche Boxster has double overhead cam (DOHC).
The 2011 Porsche Boxster has double overhead cam (DOHC).
The 2007 Porsche Boxster has double overhead cam (DOHC).