Today I noticed that the MAINT light on my dash was flashing at me after I started the car. I turned the car off and tried again-- more MAINT flashing. I was not happy that I might be having car problems (03 LTD V8) at just over 5k miles. I swore to myself the whole way home. After navigating my way through the crypticly translated manual, I discovered that the MAINT light flashes when you hit 5K miles-- in theory between oil changes. The light can be reset and will go off after the next 5k miles. I suspect that the dealer that did my earlier oil change has never read the manual either and didn't reset it.
You all may be more well versed in all of the truck's features, but I figured I'd give you a heads up and maybe save you some aggravation.