The 2018 Lincoln MKX equipped with the 3.7L Ti-VCT 6-cylinder engine requires specific lubricants to maintain peak performance and longevity. This luxury crossover relies on precise fluid viscosities and quality components to handle its V6 power plant and complex all-wheel-drive system. Using the correct AMSOIL synthetic lubricants ensures that the engine, transmission, and drivetrain receive superior protection against wear, extreme temperatures, and the stresses of daily driving. Below, we detail the recommended AMSOIL products and specifications to help you keep your Lincoln MKX running smoothly.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The top-tier choice for maximum protection, offering up to 25,000 miles of service life and exceptional performance in extreme temperatures.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – A balanced option providing 20,000 miles of protection with enhanced cleaning power to keep the engine running smoother for longer.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – An OEM-specification fluid that fights sludge and deposits while meeting manufacturer requirements at a value price.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Formulated with enhanced additives for engines with over 75,000 miles to reduce oil consumption and sludge.
- AMSOIL Oil Filter – Features a high-quality filtration element that captures small, wear-causing contaminants while maintaining lower oil flow restriction.
- WIX XP Oil Filter – A premium aftermarket option designed with advanced filtration media to outperform standard OEM filters.
- WIX Oil Filter – A reliable, cost-effective filter choice that ensures essential engine protection for standard maintenance intervals.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed, phosphate-free formula that protects cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated solution that provides superior freeze protection and thermal stability for those who prefer to mix their own coolant.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A high-performance fluid that protects the transmission against wear while offering excellent fuel efficiency.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – The ideal lubricant for the transfer case, offering advanced protection against wear and thermal runaway.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Recommended for the rear differential, providing robust protection for GL-5 applications and limited-slip differentials.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – A versatile synthetic gear lube suitable for various differential and transfer case applications requiring high performance.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – A heavy-duty synthetic gear lube designed for extreme load-carrying requirements and severe operating conditions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent responsiveness for ABS and traction control systems with a stable viscosity across a wide temperature range.
Proper lubrication is the cornerstone of engine health, especially for a vehicle with the output and torque characteristics of the Lincoln MKX’s 3.7L V6. This engine utilizes Twin Independent Variable Camshaft Timing (Ti-VCT), a technology that optimizes valve timing for both performance and fuel economy. However, variable timing systems place additional demands on the oil’s ability to flow quickly to camshaft phasers and maintain film strength under load. Synthetic motor oils formulated for this application ensure that the timing components receive the necessary lubrication immediately upon startup, reducing the potential for timing chain stretch or phaser wear. The 5W-20 viscosity grade specified by the manufacturer is critical for maintaining the correct oil pressure and flow rates required by these precision components. Without the right oil, the engine may not operate at its intended efficiency, potentially leading to reduced power output or increased fuel consumption over time.
The transmission in this model, typically the 6F50 6-speed automatic, also relies heavily on fluid quality. This transmission handles significant torque loads, particularly when the vehicle is used for towing or driving on challenging terrain. Over time, transmission fluid can degrade, leading to sluggish shifts, increased friction, and eventual wear on clutches and bearings. AMSOIL synthetic automatic transmission fluids are engineered to resist shear breakdown and maintain their viscosity index across a broad temperature range. This stability ensures that the transmission shifts smoothly whether the vehicle is idling in traffic or hauling a heavy load up a mountain pass. Maintaining the correct fluid fill level of 11 quarts for a total fill is also essential to ensure the solenoids and valves operate correctly. Neglecting the transmission fluid can lead to costly repairs, as these components are integral to the vehicle’s drivability and smooth power delivery.
Beyond the engine and transmission, the 2018 Lincoln MKX features a transfer case and rear differential that require specialized gear lubricants. The Power Transfer Unit (PTU) is a common maintenance point, requiring SAE 75W-140 synthetic rear axle lubricant to prevent thermal runaway, a condition where the fluid overheats and breaks down. The rear differential generally calls for SAE 80W-90 gear lube. Using a high-quality synthetic gear lube in these components helps control operating temperatures and prevents rust and corrosion, extending the life of the gears and bearings. Additionally, the brake system benefits from AMSOIL’s synthetic DOT 3 and DOT 4 fluid, which offers superior brake pedal feel and resistance to vapor lock in the event of heavy braking. By addressing all these lubrication points with premium synthetic products, owners can ensure their vehicle remains responsive, efficient, and reliable for years to come.
Recommended Fluid Capacities and Specifications
To perform a complete fluid service on your 2018 Lincoln MKX with the 3.7L engine, it is important to adhere to the correct capacities and torque specifications. The engine requires 6.0 quarts of oil when the filter is included. After refilling, always check the oil level to ensure it is within the safe operating range. The drain plug should be torqued to 20 ft/lbs. For the coolant system, the capacity is 11.7 quarts. The automatic transmission (6F50) has a total fill capacity of 11 quarts. If servicing the transfer case, the capacity is 0.7 pints, with drain plug torque set at 9 ft/lbs and the fill plug at 15 ft/lbs. Finally, the rear differential requires 2.4 pints of gear lube. Ensuring these capacities are met helps prevent overfilling or underfilling, both of which can lead to performance issues or component damage.
About the Vehicle
The 2018 Lincoln MKX represents the second generation of this luxury crossover, sitting comfortably between the compact MKC and the larger MKT in the Lincoln lineup. Originally introduced to compete with high-end rivals like the Cadillac XT5, Acura RDX, and Infiniti QX60, the MKX has long been a favorite among buyers seeking a blend of refined comfort and practical utility. The vehicle is built on Ford’s CD4 platform, which provides a solid foundation for the independent suspension and sophisticated all-wheel-drive system available in later model years. The 2018 model year was particularly significant as it introduced a refreshed exterior design and updated interior technology, keeping the vehicle relevant in a rapidly evolving market.
At the heart of this crossover is the 3.7L Ti-VCT V6 engine, which serves as the standard powerplant for most trims. This naturally aspirated engine delivers a robust 302 horsepower and 280 lb-ft of torque, providing ample power for highway merging, passing, and even light towing. The engine is paired with a 6-speed automatic transmission that has been refined over the years to offer smooth and intuitive shifting. While the 3.7L engine is known for its smooth power delivery, it is also renowned for its reliability when maintained with high-quality synthetic oils. The vehicle’s ride quality is often praised, with a suspension setup that balances compliance on rough roads with stability during cornering, reflecting Lincoln’s commitment to a premium driving experience.
The interior of the 2018 MKX continues the brand’s legacy of luxury, featuring high-quality materials, quiet cabin insulation, and available advanced technology packages. Many models come equipped with the SYNC 3 infotainment system, which provides a user-friendly interface for navigation, audio, and smartphone connectivity. The available Lincoln Co-Pilot360 suite of driver-assistance technologies further enhances the vehicle’s appeal, offering features like adaptive cruise control, blind-spot monitoring, and lane-keeping assist. These features make the MKX an excellent choice for families and individuals who prioritize safety and convenience in their daily commute or long-distance travel.
Despite its strong reputation, owners of the 2018 Lincoln MKX 3.7L may encounter a few common issues that can be mitigated with proper maintenance. One frequent concern involves the timing chain tensioners, which can sometimes stretch or fail prematurely if the engine oil degrades or if the wrong viscosity is used. Regular oil changes with a high-performance synthetic oil like AMSOIL Signature Series can help keep the engine clean and the tensioners functioning correctly, reducing the risk of timing-related noises or engine damage. Another potential area of concern is the transfer case in the AWD models. The PTU can overheat under heavy loads, leading to fluid breakdown and potential failure. Using AMSOIL SEVERE GEAR 75W-140 synthetic gear lube in the transfer case helps dissipate heat more effectively and protects the internal components from thermal runaway.
Additionally, some owners have reported issues with the air conditioning system, particularly regarding compressor failure or evaporator leaks. While this is less directly related to engine oil, maintaining the overall health of the vehicle’s systems, including proper coolant levels and regular checks of all fluid lines, is crucial for preventing secondary issues. Finally, the electronic power steering system in some models has shown sensitivity to electrical gremlins or sensor failures. While not a fluid-related issue, keeping the brake fluid fresh and ensuring the electrical grounding points are clean can contribute to overall system reliability. By staying proactive with maintenance and using premium lubricants, owners can significantly extend the life of their 2018 Lincoln MKX and avoid many of the costly repairs associated with these common problems.
In conclusion, the 2018 Lincoln MKX 3.7L is a capable and luxurious vehicle that rewards careful maintenance with years of reliable service. Whether you are driving in extreme cold, tackling heavy traffic, or enjoying a weekend road trip, the right lubricants can make a significant difference in performance and longevity. By following the recommended fluid specifications and using high-quality AMSOIL products, you ensure that your Lincoln MKX continues to deliver the smooth, quiet, and powerful driving experience that defines the Lincoln brand.