Yesterday, my son drove us to church in his truck. I bought this truck from the original owner in 1999 and gave it to my son when he entered the Army in 2005.
The engine is a 4.9L with 4 speed manual and 3.55 rear gears.
This truck now has 261K miles with zero internal engine work. The feedback system is still functional. It was about 35F; he depressed the accelerator 1 time and it started immediately. The tachometer showed about 1300 RPMs until he "blipped" the throttle prior to engaging reverse, when the engine speed decreased to ~1100 RPMs. As we left our house, the engine torqued up the hill with no strain. Within approximately 1/2 mile, the idle was ~750 RPMs.
Gear changes were made with no noise or difficulty and this is the original transmission.
I have watched the truck being started and there is no smoke or clatter. Following him, I have never observed any smoke even when decelerating.
He changes oil every 5K miles using Rotella T5 10W-30 and a Motorcraft FL-1A oil filter.
It was a nice drive spending time with my son!