I have maintained this vehicle very well. At this point, I have just turned over 298,000 and don't expect much more out of it. I have a plan for replacing it with a crate 5.7 hemi with 3yr/30,000 mile warranty. When will I know that it is time to take it in for a swap, and what should I expect from the current engine between now and then? The only symptoms I have suggesting that this one is wearing down is a little oil blowing past the PCV and leaving a little oil on my air cleaner box, and it is "burning" or losing 1/2 to 1 qt of oil every 1000 miles or so. Not consistent burn/loss rate, and not leaking under the car. Any experience out there in wearing out an old engine? What can I expect here on out?