Motor oil for 1987 Dodge Ramcharger 5.9L

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Keeping your 1987 Dodge Ramcharger with the 5.9L engine running smoothly requires attention to specific fluid capacities and high-quality lubricants. This classic SUV often faces the challenges of age, including heat buildup, sludge accumulation, and wear on older mechanical components. Using the correct viscosity and a robust filtration system ensures that every moving part is protected against the harsh conditions that an older engine might face during daily driving or off-road adventures.

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Engine Oil and Filtration Requirements

The 1987 Dodge Ramcharger is powered by a 5.9L (360 cubic inch) V8 engine, often identified by the engine code [W]. This engine, while robust, benefits significantly from the superior shear stability and thermal resistance of synthetic lubricants. For oil capacity, the engine requires 5.9 quarts when performing an oil change with a filter replacement. After refilling, it is crucial to check the oil level to ensure proper coverage without overfilling. The drain plug should be torqued to 20 ft/lbs to prevent leaks or stripping of the threads.

AMSOIL Signature Series 10W-30 100% Synthetic Motor Oil is the top choice for those seeking the longest possible service intervals. It offers up to 25,000 miles of protection in personal vehicles, providing significantly more engine protection against wear and horsepower loss compared to conventional oils. If you prefer a slightly more frequent change schedule or want enhanced cleaning power, the Extended-Life 10W-30 Synthetic Motor Oil offers 20,000 miles of protection and helps keep the engine cleaner by reducing deposits. For those on a budget who still require synthetic benefits, the OE 10W-30 100% Synthetic Motor Oil fights sludge effectively. Additionally, for vehicles that have accumulated over 75,000 miles, the 10W-30 100% Synthetic High-Mileage Motor Oil contains a unique chemistry with boosted detergents and anti-wear additives to reduce sludge by up to 67% and help older engines perform better.

Filtration is just as critical as the oil itself. The AMSOIL Oil Filter provides 99 percent filtering efficiency at 20 microns, which helps reduce engine wear by removing small contaminants that standard filters might miss. It also offers extended service life to match the long drain intervals of synthetic oil. Alternatively, the WIX Oil Filter serves as a high-quality OEM replacement, offering improvements in media quality over standard manufacturer filters.

Transmission and Drivetrain Lubrication

Proper transmission maintenance is vital for the longevity of the Ramcharger’s powertrain. The automatic transmissions found in this model, such as the A727 (36RH) and A999 (32RH), have specific fluid capacity requirements. The A727 requires a total fill of 6.6 quarts for a complete service, with an initial fill of 4 quarts. The A999 requires a total fill of 8.6 quarts, also with an initial fill of 4 quarts. For these systems, AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is recommended. It withstands the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions. The OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is another excellent option that guards against leaks and promotes smooth, shudder-free shifts.

For manual transmissions, such as the A435 (4-SPD), a capacity of 7 pints is required. AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube is a primary recommendation here, offering advanced protection against wear and controlling thermal runaway. The 75W-90 and 75W-110 variants are also available for specific applications requiring different viscosity grades. The SEVERE GEAR® line contains friction modifiers for limited-slip applications, helping to reduce operating temperatures and extend the life of gears and seals.

Transfer case lubrication is handled by the NP208 unit, which requires 5.9 pints of fluid. The same automatic transmission fluids (Signature Series or OE Multi-Vehicle) are recommended for this component, ensuring compatibility and protection for the transfer case’s internal gears. The drain and fill plugs should be torqued to 18 ft/lbs.

Differential and Axle Care

The Ramcharger’s front and rear differentials require specific gear lubricants to handle the stress of four-wheel drive operation. For the front Spicer 44 differential, 5.7 pints of lubricant are needed, while the Spicer 60F front differential requires 6.6 pints. The rear Spicer 60 differential (5.9 pints) and Spicer 70 differential (7 pints) may also require fluid for limited-slip applications, with specific notes on adding Mopar Trac-loc additive if controlled slip is present. For the rear axle with an 8.25 RG unit, 4.4 pints are required.

AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube is highly recommended for the Spicer front differentials and other applications requiring heavy-duty protection. It contains friction modifiers and offers excellent rust and corrosion protection. For rear limited-slip differentials, AMSOIL SEVERE GEAR® 80W-90, 75W-90, or 75W-110 100% Synthetic Gear Lubes provide the necessary load-carrying capacity and EP performance. These lubricants help prevent noise, reduce wear, and keep the differentials operating smoothly under load.

Coolant, Brakes, and Power Steering

Maintaining the cooling system is essential for the 5.9L V8. The Ramcharger holds approximately 15.3 quarts of coolant with air conditioning and 14.3 quarts without it. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed, ethylene glycol formulation that provides protection for up to 150,000 miles or 5 years. It is compatible with all cooling system metals, gaskets, and hoses and is free of phosphates, nitrates, and silicates. For those who prefer a concentrated formula, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers extended protection and can be mixed to achieve the desired concentration.

Brake fluid maintenance ensures safe stopping power. The Ramcharger utilizes DOT 3 hydraulic brake fluid meeting MS-4574 specifications. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent responsiveness for ABS and traction control systems, maintaining stable viscosity across a wide temperature range. For power steering, the Ramcharger benefits from the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid. This fluid reduces friction, helps seals stay soft to prevent leaks, and offers strong anti-wear protection, ensuring quiet and efficient operation.

Additional Protection and Storage

For owners who store their Ramcharger seasonally, AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, fighting ethanol corrosion and varnish buildup. To protect the engine internals during extended storage, AMSOIL Engine Fogging Oil is recommended to coat internal components and prevent rust. For daily maintenance, the AMSOIL P.i.® Performance Improver Gasoline Additive can restore up to 14% horsepower and improve fuel economy by cleaning fuel injectors. The Upper Cylinder Lubricant Corrosion Inhibitor further protects the fuel system and upper cylinders from corrosion and wear.

About the 1987 Dodge Ramcharger

The 1987 Dodge Ramcharger stands as a testament to the robust engineering of American muscle SUVs from the 1980s. Built on a body-on-frame chassis, it shares its roots with the Dodge D-series trucks and the Dodge Stealth, offering a blend of passenger car comfort and rugged off-road capability. Powered by a variety of engines, the 5.9L V8 is a workhorse known for its torque and reliability, making it a favorite for towing, hauling, and navigating rough terrain. The Ramcharger was distinct in the market as a full-size sport utility vehicle that didn’t compromise on power, bridging the gap between a station wagon and a heavy-duty truck.

Owners of the Ramcharger often appreciate its versatility and the ease with which it can be modified for both on-road comfort and off-road adventure. The vehicle’s reputation is built on its durability and the simple, effective mechanicals that underpin its design. However, like any vehicle from the late 1980s, the Ramcharger faces specific challenges as it ages. One common issue is the degradation of seals and gaskets, which can lead to oil leaks and coolant loss. Synthetic lubricants, with their superior sealing properties and chemical stability, are an excellent solution to help restore and maintain the integrity of these aging seals, reducing the likelihood of leaks and keeping fluids where they belong.

Another prevalent problem in older V8 engines is the buildup of sludge and varnish in the oil passages, which can restrict flow and lead to accelerated wear. The high detergent and dispersant packages found in AMSOIL synthetic motor oils are specifically designed to clean up these deposits, flushing out the system and restoring proper lubrication to critical engine components. Furthermore, the heavy-duty nature of the Ramcharger means it often encounters extreme temperatures, whether from heavy towing or hot summer driving. Standard conventional oils can break down under such stress, but synthetic alternatives maintain their viscosity and protective film strength, ensuring the engine remains cool and protected even under the most demanding conditions.

Finally, the transmission and transfer case systems in a 1987 Ramcharger can suffer from wear and friction over decades of use. The use of synthetic gear lubricants and automatic transmission fluids can reduce operating temperatures and minimize wear on gears and bearings, extending the service life of these critical drivetrain components. By addressing these common age-related issues with high-performance lubricants, owners can keep their 1987 Dodge Ramcharger running smoothly for years to come, preserving the vehicle’s legacy and utility.

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