We bought our '08 Avenger (SXT with 2.4L, not sure if it's the same 2.4 as you have) brand new and have a lifetime warranty as well as lifetime max care on it. To me, it's worth going to the dealer and telling them to do what it needs. I've only replaced plugs on it, trans flush, and coolant flush as far as I can remember. The hood does rust for some reason on that year. We had it replaced under the warranty once, but the replacement is doing the same thing. It also has some rust forming around the lower door edges. I think that's from Michigan winters and not wiping the door jambs as often as I should to get the salt out of there. Other areas were wheel hubs and starter went. But those were replaced for $100 each under max care. We just hit 100k on it.