The 2018 Jeep Cherokee equipped with the 2.4-liter inline-four engine (Engine Code B ED8 B) is a versatile crossover that demands specific attention to its fluid systems. Because this engine utilizes a turbocharger, precise lubrication is critical to manage the high temperatures generated during operation. Using fluids that meet or exceed the manufacturer’s specifications ensures optimal performance, maintains fuel economy, and extends the service life of the vehicle’s components.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – This premium option provides up to 25,000 miles of protection and features a high additive package that delivers 75% more engine protection against horsepower loss and wear compared to industry standards.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Offering up to 20,000 miles of guaranteed protection, this oil features 37% more cleaning power to help keep the engine running smoother for a longer duration.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – An excellent choice that matches the factory recommendation while delivering superior cleaning power and protection against sludge and deposits.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, this oil contains boosted detergents and enhanced anti-wear additives to reduce sludge and improve engine performance.
- AMSOIL Oil Filter – Engineered with greater capacity for small contaminants, this filter provides 99% filtering efficiency at 20 microns and reduces engine wear through lower restriction during operation.
- WIX Oil Filter – A premium aftermarket alternative that offers improvements over original equipment manufacturer-branded filters, ensuring reliable filtration for your Cherokee.
Selecting the correct motor oil for your Jeep Cherokee is about more than just keeping the engine running; it is about maximizing the potential of the 2.4-liter inline-four. This engine, often referred to as the “World Engine,” is designed to balance fuel efficiency with adequate power output. However, the added stress of the turbocharger means the oil must handle significant heat. AMSOIL Signature Series synthetic motor oils are designed to withstand these extreme conditions while maintaining their viscosity, ensuring that critical engine components remain properly lubricated from a cold start to full operating temperature. The 0W-20 viscosity grade is specifically engineered to provide excellent flow during cold starts while maintaining a protective film at high temperatures.
Beyond the engine, the cooling system of the 2018 Cherokee requires robust protection against freezing in the winter and overheating in the summer. The cooling capacity of 7.2 quarts necessitates a fluid that can effectively transfer heat away from the engine block and the turbocharger. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant provides this protection with a unique poly-organic acid formulation that protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or five years. For those who prefer a concentrated solution to mix with distilled water, AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers similar long-life protection with extended durability, capable of lasting up to 1,000,000 miles in heavy-duty applications or 150,000 miles in passenger vehicles.
The transmission system in this vehicle is equally critical. The 2018 Jeep Cherokee 2.4L typically utilizes a 9-speed automatic transmission (948TE) that requires precise fluid characteristics to operate smoothly. Shifting harshly or experiencing slippage can often be traced back to degraded transmission fluid. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is engineered to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures, providing reserve protection during heavy use. Alternatively, AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers a highly compatible option that protects against wear while maintaining the fluid efficiency required by modern transmission designs. With a total fill capacity of 6.3 quarts, ensuring the correct fluid volume and quality is essential for the longevity of the 9-speed system.
While less frequently discussed, AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is another critical component that owners should not overlook. Moisture absorption in brake fluid can lead to a spongy pedal and reduced braking efficiency over time. It offers excellent responsiveness for ABS and traction control systems. Its stable viscosity over a wide temperature range ensures consistent braking performance regardless of the weather conditions your Cherokee encounters.
Vehicle Background
The 2018 Jeep Cherokee represents a significant evolution in the compact SUV segment, blending the rugged heritage of the Jeep brand with the efficiency and refinement expected of modern crossovers. Built on the compact Fiat-Chrysler “Compact Wide” platform, this generation was designed from the ground up to offer better fuel economy and interior space compared to its predecessor, the KJ and WK generations of the past. The 2.4-liter inline-four engine, known for its reliability and balanced output, provides a sufficient powertrain for daily commuting and light off-road adventures without the complexity of a larger V6 or V8 engine.
Owners of the 2018 Cherokee often appreciate its versatility. It is neither a dedicated rock-crawler nor a pure luxury sedan, occupying a “soft-road” niche that allows for highway comfort, city maneuverability, and light trail capability. The vehicle’s independent front suspension and optional Quadra-Drive II system provide a comfortable ride on pavement while still offering the traction necessary for unpaved roads. The interior design focuses on user-friendly technology, with Uconnect infotainment systems becoming a staple of the model, enhancing the driving experience with seamless connectivity.
Despite its strengths, the 2018 Cherokee does have specific areas where proactive maintenance can prevent common issues. One of the primary areas of concern for the 2.4-liter engine is the potential for sludge buildup, particularly if the vehicle is subjected to frequent short-trip driving where the oil never fully reaches operating temperature. AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil and high-performance synthetic oils help mitigate this by maintaining cleaner internal engine components, preventing the accumulation of deposits that can clog oil passages and restrict flow.
Another known challenge involves the 9-speed automatic transmission. Some owners have reported hesitation or rough shifts, which can sometimes be exacerbated by fluid degradation over time. The fluid can break down faster than expected under severe driving conditions, leading to increased wear on clutches and gears. Utilizing a high-quality synthetic automatic transmission fluid like the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid or OE variants can help stabilize the fluid’s properties, ensuring smoother shifts and extending the transmission’s service life.
Additionally, the cooling system in the Cherokee, while robust, benefits from the superior corrosion protection and heat transfer properties of synthetic antifreeze. Older models sometimes experienced AMSOIL Propylene Glycol Antifreeze and Engine Coolant leaks or corrosion issues due to the breakdown of standard factory fluids. Switching to an extended-life coolant helps protect against rust, corrosion, and cavitation erosion, ensuring the cooling system remains efficient over the long haul. Finally, the turbocharger in the 2.4L engine is a high-speed component that relies heavily on clean oil for cooling and lubrication. Any contamination or sludge can lead to premature turbo failure, making the use of a high-quality AMSOIL Oil Filter and premium oil essential for preserving the turbo’s health and maintaining the engine’s rated power output.