[husker boxster]

Miles and age are not necessarily the only factors when it comes to replacing an AOS. How you drive can also determine health. Long runs in the upper RPM range can tear the membrane inside the AOS. Some tracks I run will go thru an AOS regardless of how new or old it is. The roval at Kansas Speedway is a perfect example. Driving NASCAR T3 was 5K+ rpm in 4th gear and T4 thru the main straight was 5th gear at 5K+ rpm. There wasn't appropriate time or locn to upshift so the AOS sustained very high rpm for the majority of the lap. It was toast after 2 days.