I have kept my Boxster what I consider long term (have had it for 15 yrs now), and have never bought into this need to preemptively change out the IMS or install an oil feed system. I don't drive it that much either (only put about 3-4K miles a year), and only change the oil every 2 yrs with Mobil 1 0w-40 (oil that most people here don't recommend). Whatever, the car runs awesome and has never failed me (have only had to replace a water pump, coolant tank, engine mount, a MAF, and brakes). It's still running. Amazing, huh?
Just drive it and enjoy it.