[The Radium King]

got a question. i've been through the boxster maintenance schedule as per porsche and understand all the inspections required, as well as the few changes/repalcements of minor parts scheduled - air filter, oil filter, polyrib belt, etc.

what i am trying to figure out is the replacement schedule for major parts - water pump, shocks/springs, clutch, motor mounts, etc. i understand that, given they are expensive components, you replace them when they wear and not necessarily on a fixed schedule, but given that a failed water pump can kill an engine quick and doesn't give much indication prior to failure one should be a bit proactive. further, i've heard lots of 'rules of thumb' for this stuff and wondering if there is a definitive list somewhere - relace shocks every ..., replace water pump every ..., etc.

thanks.