I'd recommend every 5K. IF (and that is a big IF) the IMSB really does prefer new oil, then its cheap insurance.
I replace my oil every 6 track days which works out to about every 3 months/2,500 miles.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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