Maintaining the health of your 2018 Ford Fusion with the 1.5L EcoBoost engine requires precise fluid selection to ensure peak performance and longevity. The small-displacement turbocharged engine is sensitive to oil quality, capable of delivering strong power output while delivering impressive fuel economy. However, the high operating temperatures and rotational speeds generated by the turbocharger necessitate a lubricant that offers superior thermal stability and film strength. Using the correct viscosity and additive package protects critical components, reduces wear, and maintains the efficiency that made this powertrain so popular among drivers who value both power and economy.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The ultimate choice for maximum protection, offering up to 25,000 miles of service and superior resistance to thermal breakdown and horsepower loss.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – An excellent option providing up to 20,000 miles of guaranteed protection with enhanced cleaning power to keep the engine running smoothly.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – A cost-effective 100% synthetic solution that fights sludge and deposits while meeting or exceeding original equipment specifications.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Formulated specifically for vehicles with over 75,000 miles, this oil includes seal conditioners and enhanced detergents to reduce sludge and consumption.
- AMSOIL Oil Filter – Features high-efficiency filtration media that captures 99 percent of contaminants at 20 microns, offering extended service life and superior flow compared to standard filters.
- WIX Oil Filter – A premium aftermarket alternative that provides improved filtration media over original equipment manufacturer-branded filters for those seeking a specific brand compatibility.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An extended-life, pre-mixed formulation that protects against corrosion and freezing for up to 150,000 miles, compatible with all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, non-toxic option that requires mixing with water, offering outstanding protection against metallic corrosion and erosion for up to 150,000 miles.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures, ensuring smooth shifting and protection against wear in severe service conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A synthetic transmission fluid that protects against wear while maintaining the fuel efficiency required for optimal vehicle performance.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Provides advanced protection for rear differential applications, controlling thermal runaway and protecting against rust and corrosion in limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – A premium AMSOIL SEVERE GEAR® 80W-90 gear lube that reduces operating temperatures and extends the life of seals and equipment with its robust friction modifiers.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – Engineered for severe duty, this thicker gear oil offers exceptional protection against wear and rust while helping to reduce operating temperatures.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity range that ensures consistent braking performance in varying weather conditions.
Engine Oil Specifications and Service Intervals
The 1.5L EcoBoost engine in the 2018 Ford Fusion is a sophisticated powerplant designed for efficiency and performance. It operates at high pressures and temperatures, particularly within the turbocharger housing, making the quality of the lubricating oil a critical factor in the engine’s lifespan. The engine requires a viscosity of 5W-20 to ensure proper flow during cold starts and sufficient film strength under load. When performing an oil change, the system holds 4.2 quarts, including the filter replacement. It is imperative to check the oil level after refill to ensure the correct volume is present for optimal protection.
When selecting an oil, the AMSOIL Signature Series 5W-20 stands out for its industry-leading protection. This fully synthetic oil provides up to 25,000 miles of service before needing a change, which is a significant improvement over standard conventional oils and even many synthetic blends. It offers 75% more engine protection against horsepower loss and wear compared to conventional oils, ensuring that the turbocharger and internal components remain in peak condition. The advanced additive package helps manage soot and sludge, keeping the engine clean even under severe driving conditions such as frequent short trips, extreme heat, or towing.
For drivers who prioritize a balance of performance and value, the AMSOIL Extended-Life 5W-20 offers a compelling alternative. This oil delivers up to 20,000 miles of guaranteed protection and features 37% more cleaning power to help keep the engine running smoother for longer. It is specifically formulated to protect against Low-Speed Pre-Ignition (LSPI), a common issue in turbocharged engines where premature fuel combustion can cause engine damage. This makes it an excellent choice for the Fusion’s EcoBoost engine, helping to extend the time between maintenance intervals without sacrificing protection.
Those looking for a product that closely mirrors original equipment specifications while offering synthetic benefits will appreciate the AMSOIL OE 5W-20 100% Synthetic Motor Oil. It is designed to fight sludge and deposits with its 100% synthetic formulation, ensuring that the engine remains clean and efficient. This oil is also an excellent choice for vehicles with over 75,000 miles, where the AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil becomes the preferred option. The High-Mileage formula contains unique chemistry with boosted detergents and dispersants to reduce sludge by 67%, along with seal conditioners to help prevent oil leaks and consumption in aging engines.
The oil filter is just as critical as the oil itself. The AMSOIL Oil Filter is engineered to work in tandem with the synthetic oils, offering a filtering efficiency of 99 percent at 20 microns. This means it captures a higher percentage of small, wear-causing contaminants compared to competing filters. The greater capacity and lower restriction allow the engine parts to stay lubricated effectively, reducing wear and extending the life of the engine. For those who prefer a well-known aftermarket brand, the WIX Oil Filter provides premium media that offers improvements over OEM-branded filters, ensuring reliable filtration and performance.
Transmission and Drivetrain Lubrication
The transmission in the 2018 Ford Fusion is a key component that benefits immensely from synthetic fluids. For vehicles equipped with the 6F55 automatic transmission, the total fill capacity is approximately 11.6 quarts. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures, ensuring smooth shifts regardless of the weather, and provides reserve protection during heavy use and abuse. This fluid helps extend the life of the transmission by reducing wear and maintaining optimal fluid properties over time.
If your vehicle has the 6F35 transmission, the total fill capacity is around 9 quarts. The same AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is recommended for this application, offering protection against wear while maintaining the fuel efficiency that Ford drivers expect. These synthetic transmission fluids are engineered to exceed original equipment manufacturer requirements, providing a level of protection that standard fluids cannot match.
For the differential, the 2018 Fusion requires specific gear lubricants to ensure smooth power transfer and protection of the differential gears. The rear differential capacity is approximately 2.4 pints. The AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube is an ideal choice, meeting the Ford specification WSP-M2C197-A. It contains friction modifiers for limited-slip applications and helps control thermal runaway, protecting against rust and corrosion while helping to reduce operating temperatures. For those seeking a slightly different viscosity profile, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube offers advanced protection and longer equipment life, while the AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube provides robust protection for severe service conditions.
Cooling and Braking Systems
Proper cooling system maintenance is vital for the 2018 Fusion, as the engine operates at high temperatures. The cooling system capacity is 10.9 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is an ethylene glycol 50/50 pre-mix that protects all cooling system metals, gaskets, and hoses. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it compatible with all other antifreeze and AMSOIL Passenger Car & Light Truck Antifreeze & Coolant colors. This fluid offers protection for up to 150,000 miles or five years. Alternatively, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a concentrated option that can be mixed with distilled water. It is non-toxic and greatly surpasses standards for metallic corrosion and erosion, providing protection for up to 150,000 miles in passenger cars.
The braking system also benefits from high-quality fluid. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is designed to provide excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring consistent braking performance in extreme heat or cold. This synthetic fluid helps prevent moisture absorption, which can lead to a reduced boiling point and potential brake fade.
Additional Maintenance and Care
For drivers who keep their vehicles in storage or engage in seasonal use, the AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. To prevent rust during long periods of inactivity, the AMSOIL Engine Fogging Oil is highly effective at protecting internal engine components. For those looking to maximize fuel economy and restore power, the AMSOIL P.i.® Performance Improver Gasoline Additive restores up to 14% horsepower and cleans GDI fuel injectors to 100% flow rate. It also helps control pre-ignition knock, a critical feature for turbocharged engines.
To keep the vehicle looking its best, the AMSOIL Synthetic Multi-Purpose Grease resists thermal and oxidation degradation for long-term performance. For exterior protection, the AMSOIL Heavy-Duty Metal Protector creates a long-lasting protective coating against rust and corrosion. The AMSOIL Silicone Spray protects rubber and plastic components, preventing cracking and drying. For cleaning, the AMSOIL Power Foam® Carburetor and Induction-System Cleaner maximizes horsepower and restores startability, while the AMSOIL Miracle Wash Waterless Wash and Wax Spray provides a fantastic shine and protective finish without the need for water.
About the Vehicle
The 2018 Ford Fusion represents a significant chapter in the evolution of the mid-size sedan segment in America. Part of the fourth generation of the Fusion, which debuted in 2013, the 2018 model year was part of a period where Ford focused heavily on downsizing engines to improve fuel efficiency without sacrificing driving dynamics. The vehicle is built on the Ford CD4 platform, a versatile architecture shared with the Lincoln MKZ and the first-generation Ford Explorer, offering a blend of rigidity and lightweight design that contributes to its responsive handling.
Owners of the 2018 Ford Fusion often cite its stylish, aerodynamic design as a primary attraction. It features a sleek profile that was well-received by consumers who found many competitors to be overly conservative. The interior design emphasized a focus on technology and comfort, with available trims offering premium materials and advanced infotainment systems that kept the cabin feeling modern. The vehicle positioned itself as a sophisticated alternative to traditional family sedans, appealing to drivers who wanted a car that looked and felt premium but delivered practical utility.
The heart of the 2018 Fusion’s popularity was its diverse engine lineup, headlined by the 1.5L EcoBoost and 2.0L EcoBoost four-cylinder engines. The 1.5L EcoBoost, in particular, offered a compelling balance of power and fuel economy. While the standard 2.5L Atkinson-cycle four-cylinder was the base option, the turbocharged engines were the ones that gave the Fusion a competitive edge. They provided spirited acceleration that rivaled V6-powered cars from the past, all while delivering EPA ratings that were impressive for the class. This made the vehicle a favorite for those who commuted long distances or enjoyed spirited drives on weekends, as it offered a driving experience that was far from sluggish.
Despite its high ratings, the 2018 Ford Fusion is not without common issues that owners should be aware of. One prevalent concern with the EcoBoost engines, especially the 2.5L and 1.5L variants, has been excessive oil consumption. This is a phenomenon where the engine burns oil faster than expected, potentially leading to low oil levels and engine damage if not monitored closely. This is where the use of high-quality synthetic oils like AMSOIL becomes critical; their superior thermal stability and reduced volatility can help mitigate this issue by ensuring a more consistent oil film and less evaporation at high temperatures.
Another common problem associated with the 2018 Fusion is transmission hesitation or shuddering. Drivers have reported instances where the automatic transmission hesitates to shift or shudders during acceleration, often attributed to software calibration issues or fluid degradation. While Ford has issued updates, the underlying fluid properties play a crucial role. Using a high-performance synthetic transmission fluid can provide better lubrication and stability, reducing the likelihood of harsh shifts and extending the life of the transmission components.
AMSOIL Propylene Glycol Antifreeze and Engine Coolant leaks and overheating issues have also been reported by some owners. Over time, seals and gaskets in the cooling system can degrade, leading to leaks that require expensive repairs. The use of a high-quality antifreeze like AMSOIL, with its advanced corrosion inhibitors and seal compatibility, can help protect the cooling system’s integrity and reduce the risk of leaks. Additionally, the EcoBoost engines are sensitive to carbon buildup on the intake valves, particularly in direct injection models. This can lead to rough idling and reduced performance. Regular use of a fuel system cleaner like AMSOIL P.i. can help prevent this buildup and keep the engine running smoothly.
By addressing these specific vulnerabilities with the right lubricants, owners can significantly extend the life and performance of their 2018 Ford Fusion. The vehicle remains a strong contender in the used sedan market, known for its comfort, technology, and efficient powertrains. With the right maintenance regimen, including the use of premium synthetic fluids, the Fusion can continue to provide reliable service and an enjoyable driving experience for years to come.