The 2018 Mazda CX-5 equipped with the 2.5L 4-cylinder engine is designed to deliver responsive driving dynamics and reliable fuel economy. To maintain the performance and longevity of this powertrain, owners must adhere to strict lubrication schedules using high-quality synthetic fluids. Proper lubrication is critical for managing the heat generated by the engine, protecting internal components from wear, and ensuring smooth operation of the transmission and drivetrain. Using the correct viscosity and specification fluids helps prevent sludge buildup, reduces friction, and supports the vehicle’s advanced engineering.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – The top-tier choice offering unsurpassed engine protection for up to 25,000 miles, with 75% more protection against horsepower loss and wear.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – A robust alternative providing extended change intervals up to 20,000 miles with superior cleaning power to keep the engine running smoothly.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – An OEM-mileage fluid that fights sludge and deposits while outperforming conventional oils and protecting turbochargers effectively.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce sludge, improve cleaning power, and help engines last longer.
- AMSOIL Oil Filter – Features 99% filtration efficiency at 20 microns, higher capacity for contaminants, and lower restriction to keep engine parts lubricated.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An ethylene glycol 50/50 pre-mix formulated to protect cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, phosphate-free option requiring mixing, offering protection up to 150,000 miles or 5 years in passenger cars.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing and elevated temperatures while remaining fluid in sub-zero conditions for automatic transmissions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to protect against wear while meeting OE requirements for fuel efficiency.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a stable viscosity range for safe stopping power.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Offers advanced protection for transfer cases and rear differentials, controlling thermal runaway and reducing operating temperatures.
When performing maintenance on the 2018 Mazda CX-5, understanding the specific fluid requirements for each system is essential for optimal performance. The engine oil capacity for the 2.5L engine is 4.8 quarts when changing with the oil filter. The oil drain plug torque should be tightened to between 23 and 30 ft-lbs to ensure a proper seal without damaging the threads. AMSOIL Signature Series synthetic oils are designed to meet the rigorous standards of this engine, ensuring that critical components like the variable valve timing system and turbochargers receive the necessary lubrication to function correctly under all conditions.
For the cooling system, capacity varies slightly depending on the specific configuration, but generally ranges around 7.8 to 7.9 quarts. The use of a high-quality antifreeze and coolant is vital to prevent corrosion and overheating, which can be detrimental to the aluminum components often found in modern engines. AMSOIL offers both pre-mixed and concentrated options to suit different needs, with formulations that are phosphate-, nitrate-, and silicate-free to protect all cooling system metals and rubber components.
The automatic transmission requires careful attention as well. The total fill capacity for the 6-speed transmission can range from 8.2 to 8.5 quarts, depending on whether the cooler is integrated into the radiator. Initial fills require approximately 3.5 quarts. Signature Series Fuel-Efficient Automatic Transmission Fluid provides the necessary fluidity for smooth shifting and protection against the heat generated during heavy use. This ATF helps maintain viscosity stability, ensuring the transmission operates efficiently in both extreme cold and hot summer driving conditions.
Brake fluid is another critical component often overlooked. The 2018 CX-5 utilizes hydraulic DOT 3 brake fluid. AMSOIL DOT 3 and DOT 4 synthetic brake fluid offers superior boiling points and viscosity stability compared to conventional fluids, which is essential for consistent braking performance, especially when towing or driving in mountainous terrain. Additionally, the transfer case and rear differential require gear lube. AMSOIL SEVERE GEAR® 75W-85 is recommended for these applications, providing superior protection against wear and rust while reducing the operating temperatures of the gears.
About the Vehicle
The 2018 Mazda CX-5 represents a significant evolution in the compact crossover SUV segment. Launched initially as a 2013 model, the second generation arrived for the 2017 model year, meaning the 2018 model is part of that refined platform. Mazda introduced the Kodo design language to this generation, shifting the aesthetic from the rounded, friendly look of the first generation to a sharper, more aggressive, and sporty profile. This design philosophy has resonated with buyers who wanted a vehicle that looked as dynamic as it drove.
Under the hood, the CX-5 is most commonly found with the 2.5-liter four-cylinder engine, known by the internal code [L]. This SkyActiv-G engine is a masterpiece of internal combustion engineering, utilizing a high compression ratio to extract maximum power and fuel efficiency from gasoline. While the 2.5L engine is the workhorse of the lineup, some markets and trims also offered a 2.2-liter diesel option or a more powerful 2.5-liter turbocharged variant in later years. The naturally aspirated 2.5L engine produces respectable horsepower for daily commuting and light utility, making the CX-5 a versatile choice for families and adventurers alike. It sits in a competitive market, battling against the Honda CR-V, Toyota RAV4, and Subaru Forester, but often distinguishes itself through superior handling characteristics and a more premium interior feel.
Driving the CX-5 reveals a focus on “Zoom-Zoom,” Mazda’s brand philosophy that emphasizes driver engagement. The steering is weighted to provide feedback, and the chassis is tuned to minimize body roll, making it feel more like a sports sedan than a typical soft-riding SUV. However, this sporty tuning can sometimes lead to a firmer ride quality on rough roads compared to competitors. The interior of the 2018 model year continues to benefit from the high-quality materials and intuitive infotainment system introduced in the previous generation, often praised for being one of the better systems in the industry.
Despite its reliability reputation, owners of the 2018 CX-5 may encounter a few common issues that can be mitigated with high-performance lubricants. One prevalent concern involves carbon buildup, particularly in direct injection engines, which can affect performance and fuel economy over time. Using a fuel system cleaner like AMSOIL P.i.® Performance Improver can help restore injector flow and clean combustion chambers. Another issue often reported is premature wear in the variable valve timing (VVT) actuators, which can lead to ticking noises or check engine lights; high-quality synthetic oils with robust viscosity control help keep these sensitive hydraulic components clean and functioning smoothly.
Some owners have also noted issues related to cooling system efficiency or minor leaks in the radiator hoses as the vehicle ages. Using a durable AMSOIL Passenger Car & Light Truck Antifreeze & Coolant can protect against corrosion and extend the life of cooling system components. Additionally, the CX-5’s turbocharged models (if equipped in specific trims or markets) are susceptible to oil coking in the turbo bearings if the oil degrades. AMSOIL’s signature synthetic oils are specifically tested to resist coking, protecting the turbocharger and extending its lifespan. Finally, for those who tow, the transmission fluid is a critical point of failure; regular changes with a high-synthetic ATF prevent the degradation of the fluid’s friction modifiers, ensuring smooth shifts and protecting the transmission from overheating during heavy loads.
By maintaining a strict schedule of fluid replacements using premium synthetics, owners can maximize the life of their 2018 Mazda CX-5. Whether navigating city streets or exploring off-road trails, the right lubricants provide the peace of mind that comes with knowing the vehicle is protected against the elements and wear. The combination of Mazda’s engineering and AMSOIL’s synthetic technology creates a powerful synergy, ensuring the vehicle performs as intended for years to come.