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I know someone with a 97 Boxster who does oil changes at 15k intervals and has over 150K+ miles on his original engine. I personally stick to a 10K interval, just to be safe. I think 3 or 4k mile intervals for 9 qts of M1 is a bit overkill.
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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