Buyable — if you check three things before money changes hands.

The engine burns oil with no puddle, no visible smoke, and no warning light — owners report losing about a quart every 1,000–3,000 miles without knowing. Ford's fix is TSB 19-2365: a revised (longer) dipstick and a PCM reflash that keeps the throttle plate from closing fully on deceleration, reducing the vacuum that pulls oil past the rings. It was warranty work, not a recall, so many used trucks never received it. Ask specifically whether TSB 19-2365 was performed, and check the oil level every 1,000 miles on any 5.0.

A metallic rattle on cold start that fades in about 30 seconds is the timing-chain tensioners going marginal, usually downstream of stretched oil-change intervals. Mechanics describe a cost curve, not a cost: caught at the first rattle it's a phaser/tensioner job at $800–$1,500; ignored for roughly 20,000 miles the chain stretches and the bill becomes $2,500–$4,000; ignored past that, it's an engine replacement. Ford issued warranty extensions and bulletins. Arrive for a cold start when inspecting any EcoBoost truck.

Brittle plastic coolant fittings and the Y-pipe crack suddenly, and on the 3.5 EcoBoost the water pump is chain-driven and internal — so running low on coolant escalates fast. An $18 fitting leak becomes a $1,200 water-pump job, and up to $4,000–$6,000 if the damage spreads. Mechanics recommend proactive fitting and Y-pipe replacement (about $200) at 60–100k miles. Check the coolant level and look for crusty residue at the fittings behind the engine.

Transcript-sourced issues that federal complaints barely capture: IWE vacuum 4WD hubs — cracked lines or actuator seals leave a front hub half-engaged, producing a highway growl mistaken for wheel bearings ($22 part if caught, $400–$800 once it chews bearings and CV axles — test that 4WD actually pulls). Exhaust manifold studs — cold-start tick, $200–$400 early, $800+ once a stud snaps flush. Throttle body carbon — rough or hunting idle, often 'fixed' with $300 of unneeded sensors when an $8 cleaning and idle relearn is the cure. Water intrusion into the SOD modules behind the headlights causes dash-wide electrical chaos with no scan codes. Sunroof drain tubes clog into a wet headliner ($800+ and mold). Two-piece lug nuts swell and corrode — a flat-tire problem at the worst time.