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Blackstone's lab results on my 01's annual oil change and analysis for the third year in a row says my 0W-40 M1 is doing fine and recommends 11,000 mile oil changes.
83,000 miles of hard driving and the oil level still never leaves the full mark between annual oil changes.
Just one guy's experience, but I see no reason to change at this point.
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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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