Maintaining the health of your 2018 Ram 1500 with the 5.7L HEMI V8 engine requires more than just routine checks; it demands the use of the correct fluids to handle its power output and towing capabilities. The engine, transmission, and differential systems in this truck operate under significant stress, especially when hauling cargo or navigating rough terrain. Utilizing high-quality synthetic lubricants ensures that these critical components receive the protection they need against wear, heat, and contamination. This comprehensive guide outlines the specific fluids and capacities required to keep your Ram 1500 running smoothly and reliably.
Recommended AMSOIL Products
For your 2018 Ram 1500 5.7L engine, the optimal fluid choices include AMSOIL’s premium synthetic options. The engine requires a 5W-20 viscosity grade, with a total capacity of 7.0 quarts including the filter. Below are the specific products recommended for this vehicle to ensure maximum protection and performance.
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The top-tier choice offering up to 25,000 miles of protection and superior horsepower retention.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – Provides up to 20,000 miles of protection with enhanced cleaning power to keep the engine running smoothly.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – An excellent value option that effectively fights sludge and deposits while matching original equipment specifications.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles to reduce oil consumption and sludge.
- WIX Oil Filter – A premium filtration solution that works seamlessly with the recommended motor oils to trap contaminants.
- WIX Air Filter – Ensures clean airflow to the engine, improving combustion efficiency and protecting internal components.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix formulation that protects against corrosion and freezing up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option for extended service intervals, offering exceptional protection against metallic corrosion.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and high temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Protects against wear and promotes smooth, shudder-free shifts for the 8-speed transmission.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A versatile fluid providing reserve protection during heavy use and extreme driving conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Offers excellent cold-weather performance and guards against sludge and leaks.
- AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube – Ideal for standard front differentials, helping to control operating temperatures and reduce wear.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – Specifically recommended for limited-slip rear differentials, containing friction modifiers to prevent chatter.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS responsiveness and a stable viscosity across a wide temperature range.
Proper lubrication is the cornerstone of longevity for any vehicle, but it is especially critical for the 2018 Ram 1500 equipped with the powerful 5.7L HEMI engine. This powerplant is capable of producing significant torque, which places immense stress on internal engine components. Using a synthetic motor oil like the AMSOIL Signature Series 5W-20 ensures that the engine maintains optimal viscosity even under the extreme heat generated during towing or high-speed highway driving. The oil’s superior thermal stability prevents the formation of sludge and varnish, which are common enemies of engine life. Furthermore, the extended service intervals allowed by these synthetic oils mean less downtime for your vehicle, making it an ideal choice for those who rely on their truck for work or play.
While engine oil receives the most attention, the transmission is equally vital. The 2018 Ram 1500 is typically equipped with an 8-speed automatic transmission (8HP70), which requires a fluid capable of managing complex shifting patterns and heavy loads. Conventional fluids often degrade faster under the stress of towing a trailer or hauling a heavy bed load. AMSOIL’s synthetic transmission fluids are formulated to withstand the rigors of heavy use, maintaining their viscosity and protective properties even when the fluid temperature spikes. This reduces the risk of transmission slippage, shuddering, or premature wear. The capacity for a full fluid replacement is approximately 8.8 quarts, a critical figure to note when planning your maintenance schedule. Selecting the correct fluid, whether it is the fuel-efficient OE version or the premium Signature Series, can significantly extend the life of your transmission and improve shifting crispness.
Beyond the engine and transmission, the cooling system of the Ram 1500 plays a crucial role in preventing overheating, particularly in a vehicle that is often used for demanding tasks. The cooling system capacity for this model is substantial, at 18.3 quarts. Using an antifreeze and coolant that is compatible with the vehicle’s metals and seals is essential to prevent corrosion and gasket failure. AMSOIL’s Passenger Car & Light Truck Antifreeze & Coolant is a phosphate-, nitrate-, and nitrite-free formulation that offers protection for up to 150,000 miles. This long-lasting protection ensures that the radiator, water pump, and hoses remain in good condition, safeguarding your engine against costly overheating issues. For those who prefer a concentrated solution, the Propylene Glycol Antifreeze is an excellent alternative that provides similar robust protection and can be mixed to achieve the desired freeze and boil-over point.
The final drive components, including the front and rear differentials and the transfer case, also require specialized attention. These gears endure high levels of friction and impact, especially when driving off-road or carrying heavy loads. The Ram 1500’s differential systems have specific capacities; for instance, the front standard differential holds about 2.3 pints, while the rear limited-slip differential requires roughly 4.4 pints. Using a synthetic gear lube like AMSOIL SEVERE GEAR ensures that these components are protected against thermal runaway and rust. The 75W-90 viscosity is particularly recommended for limited-slip differentials, as it contains the necessary friction modifiers to prevent the “chatter” that can occur with standard gear oils. Similarly, the transfer case, which may require 3 pints of fluid depending on the specific model (BW 44-44 or 44-45), benefits from the protection offered by AMSOIL’s multi-vehicle transmission fluid or specialized gear lubes to ensure smooth power distribution to the wheels.
Complete vehicle maintenance also extends to the braking system and the fuel system. The brake fluid in your Ram 1500 should be a DOT 3 or DOT 4 synthetic fluid to ensure consistent pedal feel and ABS performance. AMSOIL’s synthetic brake fluid offers a higher boiling point than conventional fluids, which is crucial for repeated hard braking scenarios. Additionally, fuel system cleanliness can impact the performance of your 5.7L engine. Adding AMSOIL P.i. Performance Improver can restore lost horsepower and clean the fuel injectors, ensuring that the engine runs as efficiently as it did when it left the factory. For those who store their vehicle during harsh winters or periods of inactivity, using AMSOIL Gasoline Stabilizer and Engine Fogging Oil can prevent fuel degradation and internal rust, ensuring that the truck is ready to start and run perfectly when you need it again.
Vehicle Background
The 2018 Ram 1500 Pickup represents a significant milestone in the evolution of full-size pickup trucks, showcasing how modern engineering can blend raw power with passenger car-like refinement. Introduced as part of the sixth generation of the Ram 1500, this model year continued the trend of making trucks more comfortable and capable than ever before. The vehicle is built on a dedicated truck platform that utilizes a high-strength steel frame, balancing durability with reduced weight to improve payload and towing efficiency. This generation of the Ram is widely recognized for its “class-leading” ride quality, a direct result of its independent rear suspension (IRS) design, which was carried over from the previous generation and refined for 2018.
At the heart of the most popular configuration, the 5.7L V-8 HEMI engine, is a reputation for reliability and strong performance. This engine code, often referred to as EZH 3 in technical fitment guides, is designed to deliver substantial torque curves that make it versatile for both daily commuting and heavy-duty tasks. The HEMI engine in the 2018 model typically produces around 395 horsepower and 410 lb-ft of torque, providing ample power for towing boats, trailers, or campers. The engine’s integration with the 8-speed automatic transmission was a key selling point, offering smoother gear changes and improved fuel economy compared to older four- and five-speed automatics. The transmission’s wide gear ratios allow the engine to operate in its most efficient RPM range, reducing strain on the drivetrain during long hauls.
Owners of the 2018 Ram 1500 frequently cite the spacious and well-appointed interior as a primary reason for their loyalty to the brand. The cabin features a high degree of material quality, with options ranging from practical cloth to luxurious leather and wood trim. The infotainment system, often the Uconnect 8.4-inch or 12-inch touchscreen, is considered industry-leading for its responsiveness and integration capabilities. This focus on comfort has helped the Ram 1500 compete directly with vehicles that blur the line between a luxury SUV and a truck. The market position of the 2018 Ram is unique; it appeals to those who need a workhorse but refuse to sacrifice daily drivability. Whether used as a family hauler or a tool for construction, the 2018 model holds a strong reputation for versatility and rugged capability.
Despite its robust design, the 2018 Ram 1500 is not without issues that diligent owners should be aware of. One common concern among owners of the 5.7L HEMI engine is the potential for carbon buildup on the intake valves, particularly in vehicles driven primarily for short trips or towing. This can lead to rough idling and reduced fuel economy. Regular use of a quality fuel additive like AMSOIL P.i. can help mitigate this issue by keeping the fuel system clean. Another known problem is the wear on the oil pump drive gear, which can sometimes fail prematurely, leading to low oil pressure and potential engine damage. Using a high-quality synthetic motor oil with superior shear stability can help reduce stress on the pump. Additionally, some owners have reported issues with the 8-speed transmission shuddering or “juddering” when shifting from first to second gear, particularly at low speeds. This can often be resolved or improved by flushing the system with a premium synthetic transmission fluid like AMSOIL Signature Series ATF, which ensures smoother torque converter lockup. Finally, the electronic throttle body can sometimes experience electrical failures or carbon accumulation, leading to hesitation or stalling. Keeping the throttle body clean and ensuring a healthy battery and charging system are essential preventative measures for these components. By addressing these specific areas with the correct synthetic lubricants, owners can significantly extend the life and reliability of their 2018 Ram 1500.