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0w-40 M1 is fine for our cars. M1 has put different additives in the oil to replace the ZDDP. (from a tech session at the Porsche Parade in Keystone last week.)
Please look at your warranty book and show me where it requires us to change the oil to maintain the factory warranty.
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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.
Last edited by Paul; 07-10-2009 at 07:16 PM.
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