LN Engineering recommends no longer than 5k miles, as the oil starts to breakdown at that point. Also, their magnetic drain plug is well worth the investment; not only attracts metal particles, but is much more robust so you can't strip it upon removal (you must have over-tightened it).
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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