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Blackstone told me to change my oil every 12,500 miles after I sent them a sample of my oil after 11,200 miles.
In regards to the plugs, they are steel, our cylinder heads are not, it's a good idea to remove them once in awhile before they corrode, might as well replace them while they are out.
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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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