Keeping your 2018 Honda Ridgeline running smoothly requires more than just filling the tank and checking the gauges. Proper lubrication is the lifeblood of the vehicle’s engine, transmission, and drivetrain. This truck, powered by the robust 3.5L J35Y6 V-6 engine, demands specific fluid viscosities and formulations to handle everything from daily commuting to hauling and towing tasks. Using the correct fluids ensures optimal performance, maximizes fuel efficiency, and extends the service life of your vehicle’s critical components.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – Provides unsurpassed engine protection for up to 25,000 miles or one year, offering 75% more protection against horsepower loss and wear compared to conventional oils.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Delivers extended service intervals of up to 20,000 miles with 37% more cleaning power to keep your engine running smoother for longer.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – An affordable option that fights sludge and deposits while outperforming conventional oils to meet original equipment standards.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles, featuring boosted detergents to reduce sludge and improve performance.
- AMSOIL Oil Filter (EA15K13) – Ensures 99% filtering efficiency at 20 microns with lower restriction to keep engine parts properly lubricated and reduce wear.
- WIX Oil Filter – Premium media offers improvements over original equipment manufacturer (OEM)-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mixed solution designed to exceed OEM requirements and protect cooling system metals and hoses for up to 150,000 miles.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Provides advanced protection against wear, rust, and corrosion in differentials and transfer cases, helping reduce operating temperatures.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range for superior stopping power.
The 2018 Honda Ridgeline is equipped with a 3.5-liter V-6 engine that is rated for 280 horsepower and 262 pound-feet of torque. This engine is mated to a six-speed automatic transmission, which can be either front-wheel drive or all-wheel drive depending on the specific trim level. The engine requires a specific grade of motor oil to function within Honda’s strict tolerances. For this vehicle, the manufacturer specifies a 0W-20 viscosity rating. The total fluid capacity, when including the filter replacement, is approximately 5.7 quarts. If the filter is not replaced during the service, the capacity drops slightly to 5.4 quarts. It is crucial to ensure the correct torque of 30 ft/lbs is applied to the oil drain plug and that a new washer is installed to prevent leaks.
While the engine oil and filter are the primary concerns for a standard oil change, the 2018 Ridgeline benefits significantly from attention to the rest of its fluid systems. The transmission, a critical component for both FWD and AWD models, holds a specific amount of fluid that requires a synthetic formulation to handle the rigors of shifting and towing. For the AWD configuration with the PF4A transmission, the total fill capacity is 8.7 quarts, while the FWD model with the PF5A transmission requires a total of 8.1 quarts. Using a high-quality synthetic transmission fluid helps maintain shift quality and protects against wear caused by the unique design of the Honda transmission.
Beyond the engine and transmission, the cooling system of the Ridgeline requires a specific type of antifreeze. The capacity for the cooling system is 7.5 quarts. AMSOIL offers both a pre-mixed ethylene glycol formula and a concentrated propylene glycol option. Both formulations are phosphate-, nitrate-, nitrite-, silicate-, and borate-free, ensuring compatibility with all cooling system metals, gaskets, and hoses. These fluids are engineered to protect against corrosion and erosion, extending the life of the radiator and water pump while maintaining optimal operating temperatures even under heavy loads.
Owners who utilize their Ridgeline for off-road activities or towing will also benefit from a synthetic gear lube in the transfer case and differential. The transfer case holds a specific amount of fluid, and the rear differential capacity is listed at 3.8 pints. Synthetic gear lubricants like the 75W-90 formulation provide superior thermal stability and wear protection compared to conventional gear oils. This is particularly important for the Ridgeline’s Intelligent Tractive Management system, which relies on friction modifiers within the fluid to function correctly in limited-slip applications. Additionally, the braking system operates safely with AMSOIL’s synthetic DOT 3 and DOT 4 brake fluid, which improves pedal feel and safety during emergency stops.
About the Vehicle: A History of Innovation
The 2018 Honda Ridgeline represents a unique chapter in automotive history, standing out in a crowded marketplace dominated by traditional body-on-frame trucks. When Honda reintroduced the Ridgeline in 2005, it completely redefined the pickup truck concept for the American consumer. Rather than following the industry standard, Honda engineers built the Ridgeline on a unibody platform, sharing its foundation with the Honda Pilot SUV and the Honda Odyssey minivan. This engineering decision resulted in a vehicle that drove more like a car than a truck, offering a smoother ride, better handling, and superior fuel efficiency for its class.
By 2018, the Ridgeline had evolved into the second generation of this innovative design, featuring a sleeker, more aggressive exterior design while retaining its unibody architecture. The 3.5L V-6 engine, known internally as the J35Y6, is a masterpiece of Honda engineering. It features Variable Cylinder Management (VCM), a technology that can shut down specific cylinders under light load conditions to save fuel. This engine is renowned for its smoothness, reliability, and lack of vibration, which sets it apart from many of its competitors in the mid-size and full-size truck categories. The ride quality of the 2018 Ridgeline is often praised by owners for being comfortable on the highway and composed in corners, attributes rarely found in traditional trucks.
Despite its car-like dynamics, the Ridgeline has always been a practical workhorse. One of its most celebrated features is the in-bed trunk, a lockable storage compartment built directly into the floor of the cargo bed. This was a first for a pickup truck and has since been adopted by other manufacturers. The bed itself is relatively short compared to long-bed trucks, but the interior volume is cleverly utilized, and the cargo bed is made of a composite material that is resistant to dents, rust, and corrosion. This material choice means that owners do not have to worry about the truck bed rusting out over time, a common issue with steel beds.
However, like any vehicle subjected to regular use, the Ridgeline can face specific challenges that are often related to its unique engineering and driving characteristics. Owners of the 2018 model year have reported a few common issues that proper lubrication can help mitigate. One prevalent problem involves the active torque vectoring system. This sophisticated system, which sends torque to the rear wheels, can sometimes develop a “clunk” or grinding noise, especially when the vehicle is cold or during tight turns. This issue is often attributed to wear in the coupling components or insufficient lubrication of the transfer case internals. Using a high-quality synthetic gear lube with the appropriate friction modifiers can help reduce noise and extend the life of these components by minimizing wear and heat buildup.
Another common concern among Ridgeline owners, particularly those with higher mileage, is the potential for oil consumption or sludge buildup in the engine. While the VCM system is efficient, it places unique stresses on the engine oil. If the oil degrades or becomes contaminated, it can lead to increased oil consumption and the formation of deposits on piston rings. This is exacerbated by short-trip driving where the engine does not reach full operating temperature regularly. Switching to a synthetic oil with a robust detergent package, such as the AMSOIL High-Mileage formula, can help prevent sludge accumulation and keep the VCM system functioning smoothly by ensuring that the valve lifters and engine internals remain clean.
A third area of concern involves the transmission. The 2018 Ridgeline’s six-speed automatic transmission is generally reliable, but owners who do heavy towing or drive in stop-and-go traffic may experience transmission fluid degradation over time. The fluid can become contaminated with clutch material and lose its frictional properties, leading to harsh shifting or slipping. This is especially true for the AWD models where the torque vectoring system places additional load on the transmission. Regular fluid exchanges with a synthetic transmission fluid designed to withstand high thermal loads can prevent these issues and maintain the smooth shift quality that the vehicle is known for.
Finally, brake fluid hygroscopy is a universal issue in vehicles with ABS and traction control systems, and the Ridgeline is no exception. Over time, brake fluid absorbs moisture from the atmosphere, which lowers its boiling point and can lead to a spongy brake pedal or reduced braking performance in hot conditions. This is a critical safety component, and the solution is a complete flush with a high-performance synthetic brake fluid. By maintaining a fluid that resists moisture absorption and maintains a high boiling point, owners can ensure consistent braking performance and protect the ABS module from corrosion and failure.
The 2018 Honda Ridgeline remains a standout vehicle in the truck segment, blending car-like comfort with genuine utility. By addressing its specific lubrication needs with high-performance synthetic products, owners can ensure that their vehicle continues to perform reliably for years to come. Whether for daily driving, weekend adventures, or heavy-duty work, the right fluids make a significant difference in the longevity and performance of this unique and versatile truck.