Buying a used second-generation off-road truck means weighing high performance against mechanical risk, and the 2018 model is no exception. At its core, reliability for this high-output pickup depends heavily on how past owners handled factory service bulletins and oil change intervals. If you're eyeing one on the pre-owned market, you'll need to look past the aggressive styling and factory Fox live-valve shocks to inspect the engine bay and transmission history closely.
While the 450-horsepower 3.5-liter twin-turbo EcoBoost V6 delivers massive low-end grunt, it brings documented mechanical vulnerabilities that can turn a great deal into a costly garage project. Knowing what fails, why it happens, and how to verify if previous owners addressed these flaws will save you thousands of dollars down the road.
The 3.5L EcoBoost Heart: Cam Phaser Realities
The defining mechanical talking point for this model year centers on the variable valve timing system. Early iterations of the second-generation EcoBoost engine suffer from premature wear in the cam phasers. When these components wear out, they create a distinct mechanical rattle during cold engine startups.
Ignoring this noise leads to a chain reaction of timing component wear and potential engine damage. Ford released multiple technical service bulletins and recall campaigns to address the defect, culminating in redesigned parts that permanently resolve the flaw. When inspecting a used truck, always cold-start the engine yourself. Listen intently for any metallic rattling or slapping sounds during the first three seconds of ignition.
Verifying Service Records
Never trust a seller's verbal assurance that the phasers were replaced. You'll want to review the physical repair order or check the vehicle identification number (VIN) through a local dealer network to confirm that the updated parts and powertrain control module calibration have been installed. Trucks that received the revised components after late 2019 generally operate reliably moving forward.
Transmission Performance and Shift Quality
Mated to the high-output engine is the 10-speed automatic transmission, co-developed with General Motors. While this gearbox enables efficient highway cruising and keeps the engine in its optimal power band, it has a reputation for occasionally harsh or erratic shifting.
Many owners experience rough 1-3 or 3-5 shifts, especially when the transmission fluid is cold. In most cases, a simple software reflash from a certified technician clears up the erratic behavior. However, mechanical wear within the valve body or clutch packs can occur in trucks subjected to heavy towing or frequent off-road abuse without proper fluid changes.
Fluid Maintenance Intervals
Factory guidelines often suggest lengthy intervals for transmission fluid changes, but seasoned technicians recommend dropping the pan and replacing the fluid every 50,000 miles. Fresh fluid helps protect the intricate internal solenoids and maintains smooth engagement across all ten gears.
Suspension Wear and Off-Road Components
The factory-equipped internal bypass dampers are masterpieces of off-road engineering, designed to soak up high-speed desert bumps while maintaining daily driver comfort. However, these specialized shocks are wear items, not lifetime components.
By 60,000 to 80,000 miles, the factory dampers typically require a professional rebuild or complete replacement. Worn-out shocks reveal themselves through a floaty highway ride, excessive nose-diving under braking, or visible fluid weeping along the shock bodies. Budgeting for a suspension refresh is essential when calculating the true cost of ownership for a high-mileage example.
IWE System and Front Hubs
Another common area of concern involves the Integrated-Wheel-End (IWE) system, which controls the front hubs. Vacuum leaks or moisture contamination can cause the hubs to partially engage while driving, creating an irritating grinding noise. Checking the vacuum lines and solenoid valves prevents premature wear on the front differential components.
Proactive Maintenance and Ownership Costs
Owning a high-performance vehicle requires a strict adherence to preventive maintenance. Skipping routine service schedules quickly exposes weak links in turbocharged platforms.
- Oil Changes: Change the engine oil every 3,000 to 5,000 miles using full synthetic oil that meets Ford specifications. Clean oil is vital for the proper hydraulic operation of the cam phasers and turbochargers.
- Spark Plugs: Boosted engines consume spark plugs faster than naturally aspirated alternatives. Plan to inspect or replace plugs every 35,000 to 45,000 miles to prevent misfires.
- Cooling System: Monitor the water pump and thermostat housing for early signs of coolant seepage, which can occasionally plague high-mileage EcoBoost variants.
Reviewing ownership guides like those on Car and Driver provides broader context on how this truck compares to contemporary full-size competitors in long-term durability. For official recall checks and technical bulletins, always reference the National Highway Traffic Safety Administration portal using the specific VIN of the vehicle you intend to purchase.
Frequently Asked Questions
Can the cam phaser issue happen twice on the same truck?
If the truck received the older replacement parts manufactured before late 2019, the issue could theoretically return. However, trucks fitted with the final revised part numbers and updated software calibration rarely experience repeat failures.
What is the realistic fuel economy for daily driving?
Expect around 15 mpg in mixed city and highway driving. Heavy off-road use, larger aftermarket tires, or aggressive driving will drop that figure closer to 12 mpg.
Are aftermarket tunes safe for high-mileage engines?
While performance tunes unlock more horsepower and torque, they increase cylinder pressures and thermal load. If you purchase a tuned truck, ensure it comes from a reputable tuner with supporting intercooler and exhaust upgrades to manage exhaust gas temperatures.
How do I check if all recalls have been completed?
Obtain the 17-digit VIN and enter it into the official lookup tool on the Ford Owner Site to view an active list of completed and pending safety campaigns.
