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 (the powertrain control module, the engine's computer) 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 (side obstacle detection, the blind-spot modules) 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.