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i wouldn't put too much faith in the porsche maintenance schedule. it was developed when the boxster first came out and, in the case of the 986, has not changed since. the boxster was a new car with a new engine, and there is no way that porsche could have anticipated any of the preventative maintenance issues that may arisen over the 15 years the car has been on the market. neither can you expect porsche to update their maintenance schedule to reflect these findings, as that could be seen as an assumption of liability. aos, rms, ims have all seen upgrades in reponse to an unacceptable failure rate, yet the maintenance scheudule for the old cars hasn't changed.
so, you can close your eyes to the fact that there may be preventative maintenace issues not initially recognised by porsche, or subsequently acknowledged, or you can be proactive, do your research and weigh potential damage (ie destuction of engine) again cost to preemptively address.
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