I'm close to pulling the trigger on either a '02 or '04 Deville. Both have approx 55K on them and are in almost pristine condition. My question has (of course) to do with the Northstar reliability. After reading this forum and seeing the amount of failing head gaskets reported, I'm wondering if this model is even worth considering. Can someone confirm whether the 2000+ yr heads & gaskets been redesigned or not? I've seen two posts on '00 up failures with relatively low miles, few compared with the 90's vintage, but is it just a matter of time? I know the coolant should have been changed by now, but should it have something other than DexCool?