I change my oil once a year in the fall after around 2500 to 3000 miles; Castrol Syntec 10W40 is my oil of choice. LN Engineering, Jake Raby and JFP in PA all recommend oils other than Mobil 1 0W40, for obvious breakdown characteristics.
My '02 S with 21k on the clock has no start up noise or other issues.
Not to get into an oil debate, but I wouldn't put Mobil 1 in my lawn tractor.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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