Whoooaaa Pinballjim. DIAF ?
Chances are the work was done right or it wouldnt have made it out of the factory. But as with anything, things do go wrong. The toymotor and honda dealerships have service departments too at their dealerships and they're always full, and NO the people just arnt getting oil changes or wiper blade replacements.
The number one problem for car or truck, BAD GAS. If you buy gas from Joe Schmoo's thrifty gas, then you get 87 octane with the minimum required EPA detergents. If you buy a branded gas, chances are you get better detergets and a guarantee. Joe Schmoo might be a few pennies cheaper on the gallon, but will cost you in the long run. Ford recomends BP gas, but not all areas have a BP station, so a Shell or Marathon equvilient will do.
Bad Gas can cause anywhere from fuel line or pump issues, injector clog up to injector failure, improper combustion leaving lots of carbon in the combustion chamber, fouling out the spark plugs pre-maturely. Extra carbon then doesnt exit out the exhaust or if it does, getting stuck in the manifold or if it makes it to the catalytic convertor or even the muffler. Carbon getting mixed with the oil, then possible gumming up the oil pump (why do you think there is alot of sludge in lots of oil pans?)
With any vehicle at every 20,000 miles, you should buy 2 bottles of Chevron Techron

Put in a full 93 octane tank and one bottle of Techron, run all that out. Fill again with 93 octane and other bottle of Techron. Run that out, then go back to your regular gasoline.
This cleans dirt from the injectors - fuel line and carbon from the engine. You will notice a difference with how the vehicle runs!
Better yet, if you have Chevron Stations in your area, use their gas because they put this stuff in their gas already!
Yes, bad gas is usually the start of alot of other issues like the O2 sensors, sticking lifters and the likes going bad too.
Just because the japs made it, doesnt mean it wont break!
Fordman