Looking to purchase a Boxster-Should I be worried

[Jager]

Another possibility is that the AOS was recently replaced and there was oil remaining in the cross-over tubes. Whoever replaced the AOS did not spend the time to clean out all of the oil from the failed AOS. Not a big deal, the remaining oil in the cross-over tubes will eventually get sucked into the cylinders, especially when you open-up the throttle.