I'm a simple factory filter guy (Mahle) with combined highway/track use (drive to/from track events to race, that's it). But with almost continual track use, I also change the oil every 90 days.
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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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