I have 225K on a 2005 Lincoln Aviator with a 4.6L V8. I bought it used at 56K and have run Mobile 1 5W-30 High Mileage with 6K change intervals for the last 156K. All original and runs fine. If you're not running full synthetic, you might want to switch. If you are running full synthetic, I don't know what to tell you.