Ford F-350 Years to AvoidThe weakest years — and the one you should buy instead

The EGR (Exhaust Gas Recirculation) cooler frequently clogs and fails, leading to coolant entering the exhaust or cylinders, often causing head gasket failure. The engine oil cooler also clogs, reducing oil flow to critical components and leading to high Exhaust Gas Temperatures (EGTs) and further EGR issues. Head gaskets, often weakened by excessive cylinder pressures and heat, frequently fail, requiring expensive repairs. Standpipes, dummy plugs, and the STC (Snap-To-Connect) fitting within the HPOP (High Pressure Oil Pump) system are also common failure points that can cause no-start conditions.

The Fuel Injection Control Module (FICM) is prone to voltage drops and failure, particularly in colder climates, leading to hard starts, misfires, or no-start conditions. Various sensors, including the Crankshaft Position Sensor (CKP), Camshaft Position Sensor (CMP), and Engine Oil Temperature (EOT) sensor, are known to fail, causing erratic engine behavior or diagnostic headaches. Wiring harnesses, especially around the engine, can also degrade and cause intermittent issues.

While generally robust, the 5R110 transmission can suffer from valve body issues, solenoid failures, and fluid degradation when subjected to consistent heavy towing without regular maintenance. Overheating due to heavy loads or inadequate cooling can accelerate wear, leading to harsh shifts, delayed engagement, or eventual failure.

The 6.0L Power Stroke diesel engine is plagued by design flaws, including failure-prone EGR coolers, clogged oil coolers leading to turbo and HPOP failures, STC (standpipe and dummy plug) fitting leaks, and injector issues. Head gaskets are also a common concern, especially after overheating.

Due to its heavy-duty nature and common use for towing, the front end components such as ball joints, tie rod ends, track bar bushings, and the steering gearbox wear out prematurely. This leads to loose steering, wandering, and excessive tire wear.

Body panels, particularly cab corners, rocker panels, and wheel arches, are highly susceptible to rust. Frame rust and corrosion on brake lines, fuel lines, and suspension components are also widespread, especially in regions that use road salt.

The 6.0L Power Stroke is infamous for failures including EGR cooler clogs, oil cooler failures, high-pressure oil pump (HPOP) issues, fuel injection control module (FICM) failures, and sticky injectors. These often lead to overheating, stalling, loss of power, and can cascade into major engine damage.

Frame rot, cab corners, rocker panels, bed supports, and critical brake/fuel lines are highly susceptible to severe rust, especially in areas exposed to road salt. This compromises structural integrity and can lead to safety concerns and costly repairs.

Common complaints include issues with the instrument cluster (gauge erraticism, intermittent power), wiring harness chafing leading to shorts (particularly under the hood), and occasional PCM failures, resulting in various warning lights or drivability problems.

The EGR cooler frequently clogs and fails, leading to head gasket issues, often due to a clogged oil cooler which prevents proper oil cooling and reduces engine efficiency.

Fuel injector stiction and failure, along with High-Pressure Oil Pump (HPOP) and STC (Standpipe and Dummy Plug) fitting issues, are widespread, causing no-start conditions or reduced power.

Frames, cab corners, rocker panels, and bed supports are highly susceptible to rust, particularly in regions that use road salt, compromising structural integrity.

The 6.0L Power Stroke is infamous for EGR cooler failures, which often lead to head gasket issues. Clogged oil coolers can also cause HPOP and turbocharger failures. Fuel injector stiction and FICM problems are also common. These issues are widespread and expensive to fix.

Common complaints include issues with the instrument cluster, window regulators, power door locks, and climate control system. While not typically catastrophic, these can be frustrating and costly to diagnose and repair.

Frame rust is a significant concern, especially in regions that use road salt. Cab corners, rocker panels, and wheel wells are also prone to severe rust, impacting structural integrity and appearance.

The 6.4L Power Stroke is infamous for premature failures including EGR cooler rupture, DPF clogging, turbocharger failure, fuel injector issues, and even head gasket leaks. These often stem from the complex emissions system.

Common in salt-belt states, significant rust forms on cab corners, rocker panels, rear wheel wells, and bed supports. Frame rust can also be problematic, compromising structural integrity over time.

Owners report issues ranging from instrument cluster failures, wiring harness chafing leading to shorts, HVAC control module glitches, and problems with various sensors or body control modules.

Early 6.7L Power Stroke turbochargers are notorious for failures, often due to exhaust side bearing issues or oil leaks. This can lead to a complete loss of power and potentially costly engine damage if components are ingested.

The Bosch CP4.2 high-pressure fuel pump (HPFP) used in early 6.7L Power Strokes is prone to failure, often due to fuel quality or design flaws, sending metal debris throughout the entire fuel system. This necessitates replacement of the HPFP, injectors, fuel lines, and often the fuel tank.

The Exhaust Gas Recirculation (EGR) cooler and valve on the 6.7L Power Stroke are susceptible to clogging and failure, leading to coolant loss, reduced engine performance, and potential check engine lights. Neglecting this can impact DPF regeneration and overall engine health.

Corrosion is endemic, particularly in rust-belt regions. Cab corners, rocker panels, fender wells, bed floors, and critical frame sections are highly susceptible to advanced rust, leading to structural integrity issues and expensive repairs.

The wiring harnesses, connectors, and switches are over 40 years old, leading to brittle wires, intermittent component failures (lights, gauges, radio), and potential short circuits. Grounding issues are extremely common.

After decades of heavy use, components like kingpins (on 2WD), ball joints (on 4WD), tie rods, leaf spring bushings, and the steering gear box will exhibit significant wear, leading to sloppy steering, poor alignment, and unsafe handling.

Forty years of exposure means extensive rust is almost guaranteed. Common areas include cab corners, floor pans, fender wells, bed supports, and critical frame sections, compromising structural integrity if severe.

Gasoline engines suffer from carburetor wear, vacuum leaks, and fuel line corrosion. Diesel 6.9L IDI models can experience injection pump failures, injector issues, and glow plug system malfunctions, leading to hard starts and poor performance.

Aging wiring harnesses, brittle insulation, corroded grounds, and failing relays lead to intermittent issues with lights, gauges, ignition, and charging. While rarely stranding, it's a persistent nuisance for owners.

The EGR (Exhaust Gas Recirculation) cooler commonly fails, often leading to ruptured oil coolers which then clog the oil passages, starving the turbo and contributing to head gasket failure due to increased cylinder pressures. Fuel Injection Control Module (FICM) failures are also common, causing misfires and no-starts.

Beyond the FICM, common issues include failing alternators, battery drain problems due to parasitic draws, and various sensor failures (e.g., crank position sensor, camshaft position sensor) that can cause rough running or no-start conditions.

Given its heavy-duty nature and the weight it often carries, front-end components like ball joints, tie rod ends, and track bar bushings wear out, leading to loose steering, wandering, and uneven tire wear. Steering gearboxes can also develop excessive play.

Known for issues with the DPF (Diesel Particulate Filter) system, EGR (Exhaust Gas Recirculation) coolers, turbocharger failures, and potential for cylinder wall scoring or piston failures, often stemming from regeneration cycles and fuel dilution. These failures can be catastrophic.

The high-pressure fuel pump (HPFP) can fail, sending metal debris throughout the entire fuel system, requiring complete replacement of injectors, fuel lines, rails, and tank cleaning. Injectors themselves can also fail prematurely.

Frame, cab corners, rocker panels, and wheel wells are highly susceptible to rust, especially in regions with road salt. Exhaust components and brake lines also corrode quickly.