Ford F150 Lariat 2018 – Master Your Truck’S Maintenance, Performance
The 2018 Ford F-150 Lariat is a sophisticated blend of luxury and rugged capability, featuring the advanced 10-speed transmission and powerful EcoBoost or Coyote engine options. Maintaining this specific model year requires a mix of traditional mechanical skills and an understanding of its modern electronic systems to ensure long-term reliability.
Owning a premium pickup means you value both the workhorse nature of a truck and the refined comfort of a luxury vehicle. You expect your truck to haul a trailer over a mountain pass on Saturday and provide a smooth, quiet commute on Monday morning.
The ford f150 lariat 2018 represents a high-water mark for the thirteenth generation, but it does come with specific maintenance needs that every owner should master. In this guide, I will walk you through the essential technical checks, common troubleshooting steps, and performance upgrades that will keep your truck in peak condition.
Whether you are a seasoned DIY mechanic or a first-time truck owner, these insights will help you save money and avoid costly shop visits. We will cover everything from the 10R80 transmission quirks to the intricacies of the 4WD system, ensuring you have the confidence to handle any challenge.
Essential Maintenance Strategies for Your ford f150 lariat 2018
Regular maintenance is the bedrock of truck longevity, especially for a vehicle as complex as the ford f150 lariat 2018. This model year saw the widespread adoption of the 10-speed automatic transmission, which requires specific attention to fluid health and software updates.
Start by establishing a rigid oil change interval that ignores the optimistic “Oil Life Monitor” on your dashboard. If you drive in dusty conditions, tow frequently, or deal with extreme temperatures, change your oil every 5,000 miles using full synthetic 5W-30 for EcoBoost engines or 5W-20 for the 5.0L V8.
Always use a high-quality filter like the Motorcraft FL-500S or FL-2062, depending on your engine. These filters feature a silicone anti-drainback valve that prevents dry starts, which is critical for protecting the sensitive cam phasers found in these modern Ford engines.
The 10R80 Transmission Health Check
The 10-speed transmission in the 2018 model is known for its efficiency but can occasionally exhibit harsh shifting or “gear hunting.” Check the fluid level using the small dipstick located under the vehicle on the passenger side of the transmission case.
Be careful when checking this, as the dipstick is located near the hot exhaust. You will need a 19mm wrench to remove the cap. Ensure the fluid is a bright red color; if it smells burnt or looks dark brown, it is time for a pan drop and a fresh fill of Mercon ULV fluid.
Spark Plug Maintenance for EcoBoost Owners
If your Lariat is equipped with the 2.7L or 3.5L EcoBoost, spark plugs are a “wear item” that needs frequent attention. These twin-turbocharged engines are hard on plugs due to high cylinder pressures and carbon tracking.
I recommend replacing the plugs every 30,000 to 40,000 miles to maintain fuel economy and prevent misfires under load. Always gap your plugs to exactly.028 or.030 inches using a feeler gauge to ensure the spark doesn’t blow out under high boost levels.
Understanding the Powertrain Options and Common Issues
The ford f150 lariat 2018 came with several engine choices, each with its own set of personality traits and potential gremlins. Knowing what is under your hood allows you to anticipate problems before they leave you stranded on the side of the road.
The 3.5L EcoBoost is the towing king, but it is susceptible to “cam phaser rattle” upon cold starts. If you hear a loud clicking or tapping noise for the first few seconds after starting the engine, your phasers may be failing. Addressing this early can prevent timing chain stretch and more expensive internal damage.
The 5.0L Coyote V8 is a favorite for its sound and linear power delivery, but the 2018 version introduced plasma-wire arc spray cylinder liners. Some owners report higher-than-normal oil consumption with this engine. Check your dipstick weekly to ensure you aren’t running low between changes.
Troubleshooting the IWE (Integrated Wheel End) System
A common issue for Lariat owners with 4WD is a grinding noise coming from the front wheels, often described as “marbles in a tin can.” This is usually caused by a failing IWE actuator or a leak in the vacuum lines that control the front hubs.
When the engine is running, vacuum holds the hubs in the “disengaged” position. If there is a leak, the hubs try to engage while you are driving in 2WD, causing that terrible grinding. Replacing the check valve (a cheap $20 part) often solves the problem before the actuators are permanently damaged.
Managing the Auto Start-Stop System
The 2018 model features an aggressive Auto Start-Stop system designed to save fuel. While beneficial for emissions, it puts extra strain on the battery and starter motor. If your truck stops shutting off at stoplights, it is often a sign that your AGM battery is beginning to lose its charge capacity.
Many DIYers use a tool called FORScan to modify the truck’s software and disable this feature permanently. If you prefer to keep it, ensure you replace your battery with the correct Cold Cranking Amp (CCA) rating to handle the frequent restart cycles.
Optimizing the Suspension for Off-Road and Towing
The stock suspension on the ford f150 lariat 2018 is tuned for comfort, which is great for the highway but can feel “floaty” when towing or driving off-road. Upgrading a few key components can transform how the truck handles weight and rough terrain.
If you find the rear of the truck sags significantly when hooked to a trailer, consider installing a set of sumosprings or airbag helpers. These provide progressive support without ruining the unladen ride quality that makes the Lariat trim so desirable.
For those who head off-road, a simple “leveling kit” can provide the clearance needed for larger tires. However, be aware that lifting the front end changes the geometry of your CV axles and upper control arms. I recommend a maximum of 2 inches of lift to avoid premature wear on your 4WD components.
Shock Absorber Upgrades
The factory shocks are often the first part to wear out, usually by 50,000 miles. Upgrading to a set of Bilstein 5100 or Fox 2.0 shocks will significantly reduce body roll and “brake dive.” This makes the truck feel more planted and confident, especially when navigating winding mountain roads.
Tire Selection for Versatility
Choosing the right tire is a balance between road noise and off-road grip. An All-Terrain (A/T) tire with a Three-Peak Mountain Snowflake rating is the best choice for Lariat owners who experience all four seasons. This ensures you have traction in snow and mud without the deafening hum of a dedicated mud-terrain tire.
Interior Care and Technology Maintenance
The Lariat interior is known for its leather-trimmed seats and the Sync 3 infotainment system. Keeping these elements functional is key to maintaining the resale value of your ford f150 lariat 2018 over the long haul.
Leather seats require cleaning and conditioning at least twice a year to prevent cracking, especially in sun-drenched climates. Use a pH-balanced leather cleaner and a microfiber towel to remove dirt, followed by a high-quality conditioner to keep the hides supple.
The Sync 3 system can occasionally become sluggish or freeze. You can often fix this by performing a “master reset” in the settings menu or by updating the software via a USB drive from the Ford support website. Keeping the software current ensures compatibility with the latest smartphone apps and navigation data.
Panoramic Sunroof Maintenance
If your Lariat is equipped with the twin-panel panoramic sunroof, it requires specific maintenance to prevent leaks and “popping” noises. Clean the rubber seals regularly and apply a Krytox lubricant to keep the glass moving smoothly. Also, ensure the four drain tubes located in the corners of the roof frame are clear of debris to prevent water from entering the cabin.
Addressing Cabin Air Quality
Don’t forget the cabin air filter, located behind the glove box. Many owners overlook this, leading to musty smells and reduced A/C performance. Replace this filter every 15,000 miles, especially if you drive on dirt roads or live in high-pollen areas. A carbon-activated filter is a great upgrade for neutralizing odors.
Essential Tools for the 2018 F-150 DIYer
To work on your ford f150 lariat 2018 effectively, you need a specific set of tools. Modern Fords use a mix of metric fasteners and specialized clips that can be frustrating if you aren’t prepared.
- OBDII Scanner: A basic code reader is good, but an OBDLink EX cable paired with FORScan software is the gold standard for F-150 owners. It allows you to run diagnostics and change hidden settings.
- Metric Socket Set: You will mostly use 8mm, 10mm, 13mm, 15mm, and 18mm sockets. A 21mm deep-well socket is required for the lug nuts.
- Torque Wrench: Critical for lug nuts (150 lb-ft) and internal engine components. Never guess on the tightness of suspension bolts.
- Plastic Trim Tools: These are essential for removing interior panels or the grille without scratching the paint or breaking the plastic clips.
- Fluid Extraction Pump: Since the 10-speed transmission and differentials don’t always have easy drain plugs, a pump makes fluid changes much cleaner.
Safety First: Working Under Your Truck
Safety is paramount when performing your own maintenance. A truck as heavy as the F-150 requires sturdy equipment to support its weight. Never rely solely on a floor jack when working underneath the vehicle.
Always use jack stands rated for at least 3 tons and place them on the frame rails, not the body or suspension components. If you are working on a driveway, use wheel chocks on the tires that remain on the ground to prevent the truck from rolling.
Wear safety glasses when working under the chassis to protect your eyes from falling rust, dirt, or dripping fluids. If you are handling chemicals like brake fluid or used engine oil, wear nitrile gloves to prevent skin irritation and long-term health risks.
Frequently Asked Questions About the ford f150 lariat 2018
What is the most common issue with the ford f150 lariat 2018?
The most frequent complaints involve the 10-speed transmission’s shift quality and the cam phaser rattle on the 3.5L EcoBoost engines. Most transmission issues can be resolved with a “re-learn” procedure or a software update from the dealer, while cam phaser issues usually require mechanical replacement of the phaser units.
How often should I change the coolant in my 2018 F-150?
Ford recommends the first coolant change at 100,000 miles, but many experts suggest doing it at 60,000 miles or every 5 years. Use only Motorcraft Orange or the newer Motorcraft Yellow coolant (which is backward compatible). Never mix different types of coolant, as it can lead to clogging in the heater core.
Can I use regular 87 octane gas in the 2018 Lariat?
Yes, the truck is designed to run on 87 octane. However, if you have an EcoBoost engine or the 5.0L V8 and you are towing a heavy trailer, switching to 91 or 93 octane is highly recommended. Higher octane prevents “knock” and allows the engine computer to advance timing, giving you more power and better efficiency under load.
Why does my 4WD light flash when I try to engage it?
A flashing 4WD light usually indicates that the transfer case motor or the IWE system has failed to engage properly. This is often due to a lack of use. I recommend engaging your 4WD system (on a loose surface like gravel) at least once a month to keep the actuators and internal gears lubricated and moving freely.
The Road Ahead for Your Lariat
The ford f150 lariat 2018 is a remarkable machine that offers a level of versatility few other vehicles can match. By staying ahead of the maintenance curve and addressing small issues like IWE vacuum leaks or transmission software updates early, you can enjoy hundreds of thousands of miles of trouble-free driving.
Remember that a truck is more than just a tool; it is an investment in your freedom to explore, work, and travel. Treat it with the respect it deserves, use high-quality parts, and don’t be afraid to get your hands dirty. The satisfaction of maintaining your own vehicle is one of the greatest rewards for any automotive enthusiast.
Keep your eyes on the road, your fluids topped off, and your tires aired up. Whether you are heading to the job site or the campsite, your F-150 is ready for the journey. Stay safe and stay comfortable!
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