I have a Automatic 1993 F250 7.3 IDI, approaching 219,000 miles. I have heard these diesels can go 500,000 miles....seems high to me, I guess it depends on how you maintain it. Mine is still original as far as I know (headgasket has never been replaced). What type of mileage do you have, and any ideas on how long these engines will last? I am on at least the 2nd transmission rebuild. Thanks.