Keeping your 2018 Lincoln MKZ running smoothly requires more than just following a standard maintenance schedule; it requires using the right fluids designed to handle the specific demands of its 3.0L EcoBoost engine and advanced drivetrain. This vehicle features a turbocharged powerplant that operates under high temperatures and pressures, making the choice of lubricant critical for longevity. Using high-performance synthetic fluids ensures that your engine receives superior protection against wear, sludge, and deposit buildup, while also maintaining optimal fuel economy. From the transmission to the cooling system, every fluid in this luxury sedan plays a vital role in preventing costly repairs and preserving the vehicle’s sophisticated driving characteristics.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Provides unsurpassed engine protection for up to 25,000 miles, ideal for the high-performance needs of the turbocharged 3.0L engine.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Offers 37% more cleaning power and 20,000 miles of protection, keeping the turbocharger and engine components running cleaner for longer.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A budget-friendly 100% synthetic option that outperforms conventional oils and fights sludge effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce leaks and sludge while boosting engine performance.
- AMSOIL Oil Filter – Provides 99% efficiency at 20 microns with greater capacity to trap wear-causing contaminants, extending service life.
- WIX Oil Filter – A premium aftermarket filter option featuring improved media that offers better filtration than many OEM-branded equivalents.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix formulation that protects cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option for extended protection up to 150,000 miles or 5 years, ideal for varying temperature climates.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and remains fluid in sub-zero conditions for the 6-speed transmission.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – An economical synthetic option that protects against wear and maintains fuel efficiency.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – The recommended lubricant for the Power Transfer Unit (PTU), controlling thermal runaway and protecting against rust.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Specifically designed for the rear differential with a Torque Vectoring Drive system, meeting Ford specifications.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Suitable for rear differentials without a TVD system, meeting WSP-M2C197-A specifications.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent responsiveness for ABS and traction control systems with a stable viscosity over a wide temperature range.
The 2018 Lincoln MKZ with the 3.0L V-6 EcoBoost engine is a sophisticated machine that demands high-quality lubrication. This powerplant generates substantial horsepower and torque, relying on the oil to lubricate not only the piston rings and bearings but also the turbocharger and variable valve timing components. Standard conventional oils can break down under the intense heat of the turbo, leading to sludge formation and potential component failure. AMSOIL synthetic motor oils, such as the Signature Series, are engineered to resist this breakdown, ensuring that the engine remains clean and protected even after thousands of miles of driving. The 5W-30 viscosity is the recommended grade for this engine, balancing cold-start protection with high-temperature stability.
Fluid capacity is an important factor to consider when performing maintenance on this vehicle. The 3.0L engine requires 6 quarts of oil when changing the AMSOIL Oil Filter. This capacity ensures that the oil pump maintains proper pressure throughout the entire lubrication circuit, from the crankshaft to the cylinder heads. When performing a fluid exchange, it is crucial to fill the system to the correct level to avoid overfilling, which can cause foaming and increased pressure, or underfilling, which can lead to oil starvation. After refilling, the oil level should always be checked to confirm proper operation.
Beyond the engine, the cooling system of the 2018 MKZ is equally critical. The vehicle utilizes a large coolant capacity, with the AWD model requiring approximately 11.3 quarts and the FWD version needing about 11.4 quarts. Maintaining the correct antifreeze mixture is essential for preventing overheating, which can be a particular concern with the turbocharged engine. AMSOIL coolants are designed to exceed OEM requirements, offering protection against corrosion, erosion, and freeze-ups. Using a high-quality antifreeze like the Passenger Car & Light Truck Antifreeze & Coolant ensures that the cooling system remains free of rust and scale, which can clog narrow passages and cause the engine to run hotter than intended.
The drivetrain of the Lincoln MKZ also requires specialized attention. The 6-speed automatic transmission (6F55) is a complex unit that benefits greatly from synthetic transmission fluids. The total fill capacity is 11.6 quarts, a significant amount that requires a high-quality fluid to maintain proper hydraulic pressure and shifting characteristics. Using a fluid like the Signature Series Fuel-Efficient Automatic Transmission Fluid ensures that the transmission shifts smoothly and resists the thermal breakdown that occurs during heavy towing or in stop-and-go traffic. For the rear differential, the requirements vary depending on whether the vehicle is equipped with the Torque Vectoring Drive (TVD) system. Vehicles with TVD require 75W-85 gear lube, while those without it require 80W-90. The all-wheel-drive Power Transfer Unit specifically calls for 75W-140 gear lube to handle the transfer of power between the front and rear axles without seizing or overheating.
Why Proper Lubrication Matters for the 2018 MKZ
Proper lubrication is the cornerstone of vehicle longevity, but for the 2018 Lincoln MKZ, it is even more critical due to its engineering. The EcoBoost engine’s turbocharger spins at incredibly high speeds, generating intense heat. Without a synthetic oil that maintains its viscosity and lubricating properties under these conditions, the turbo bearings can fail prematurely. Furthermore, the variable valve timing system relies on clean oil to operate the phasers that adjust valve timing; sludge or varnish can clog the oil passages, leading to rough idling or loss of power. By using AMSOIL synthetic oils, you ensure that these sensitive components are protected, extending the life of the engine and maintaining the vehicle’s performance.
The transmission fluid also plays a pivotal role in the driving experience of the MKZ. The 6F55 transmission is known for requiring precise fluid viscosity to execute smooth shifts. Synthetic transmission fluids resist oxidation and thermal breakdown better than conventional fluids, which means the fluid maintains its protective qualities for longer intervals. This is particularly beneficial for drivers who tow trailers or drive in extreme temperatures, as the fluid remains stable and continues to protect gears and clutches from wear. Similarly, the brake fluid in the MKZ must maintain a high boiling point to prevent vapor lock during heavy braking. AMSOIL’s DOT 3 and DOT 4 synthetic brake fluid provides superior performance in this regard, ensuring consistent pedal feel and responsive stopping power in all weather conditions.
About the Vehicle: 2018 Lincoln MKZ
The 2018 Lincoln MKZ represents a significant chapter in the history of Lincoln’s sedan lineup, blending the brand’s tradition of luxury with modern, efficient performance technology. Positioned as a midsize luxury sedan, the MKZ competed directly with rivals like the Acura TLX, Infiniti Q50, and the Lexus ES. The 2018 model year offered a refreshed design, featuring updated exterior styling cues that aligned with Lincoln’s “Inspiration” design language, characterized by a more assertive grille and sleek LED lighting signatures. Under the hood, the 3.0L V-6 EcoBoost engine was a standout choice for owners seeking performance. This twin-turbocharged powerplant delivered robust horsepower and torque, providing a driving experience that was both powerful and responsive, distinguishing it from the standard 2.0L turbo or the naturally aspirated V-6 options available in other trims.
Designed on the Ford D4 platform, the MKZ shared its architecture with the Ford Fusion but received enhancements in sound insulation, suspension tuning, and interior materials to elevate the luxury experience. The vehicle offered a comfortable ride quality, absorbing road imperfections with ease, which made it a popular choice for commuters and long-distance travelers. The interior was spacious, featuring premium materials such as soft-touch surfaces, available leather seating, and the SYNC infotainment system for seamless connectivity. The 3.0L AWD configuration added versatility to the sedan, allowing owners to navigate wet or snowy conditions with confidence without sacrificing the smooth handling dynamics associated with the brand.
While the 2018 MKZ is a robust vehicle, owners of the 3.0L EcoBoost model should be aware of a few specific issues that can arise over time, particularly related to the engine and cooling systems. One common problem is oil consumption, where the turbocharged engine may burn oil faster than expected due to piston ring issues or turbocharger seal wear. Using a high-quality synthetic oil with robust additive packages can help mitigate sludge buildup that contributes to ring sticking and can reduce the likelihood of excessive consumption. Another potential issue involves the cooling system, where the thermostat or water pump may fail prematurely, leading to overheating. High-performance coolants that provide better heat transfer and corrosion protection can help extend the life of these components.
Additionally, the Power Transfer Unit (PTU) in the AWD models is a known weak point. This component transfers power to the rear wheels and is prone to fluid degradation and failure, which can lead to a distinct whining noise or complete drivetrain loss. Regular fluid changes using a synthetic gear lube like AMSOIL SEVERE GEAR, which is specifically formulated to withstand the thermal stress of the PTU, is a proactive maintenance step that can prevent expensive repairs. Finally, some owners have reported issues with the transmission shifting harshly or slipping, often attributed to transmission fluid breakdown. Flushing the system with a high-quality synthetic transmission fluid can restore shift quality and protect the transmission’s internal components, ensuring the smooth operation expected from a luxury Lincoln. By staying on top of these maintenance needs with the right fluids, 2018 MKZ owners can enjoy the reliability and performance their vehicle was built to deliver.