Maintaining the 1985 Mitsubishi Pickup with the 2.6L engine (Engine Code [E] E) requires precision when it comes to fluid selection. This vintage pickup, powered by the reliable 4-cylinder engine, depends on high-quality lubricants to withstand modern driving demands while respecting its original design tolerances. Proper maintenance ensures the engine runs smoothly, extends the vehicle’s lifespan, and preserves the driving character that owners have come to appreciate over the decades. Whether you are commuting daily or using the truck for light hauling, selecting the correct viscosity and formulation is critical for optimal performance.
Recommended AMSOIL Products
- AMSOIL Signature Series 10W-30 100% Synthetic Motor Oil – Provides 75% more engine protection against horsepower loss and wear, offering guaranteed protection for up to 25,000 miles or one year for this 2.6L engine.
- AMSOIL Extended-Life 10W-30 100% Synthetic Motor Oil – Delivers 37% more cleaning power to keep the engine running smoother for longer, with 20,000 miles of guaranteed protection between changes.
- AMSOIL OE 10W-30 100% Synthetic Motor Oil – Fights sludge and deposits with a 100% synthetic formulation designed to protect turbochargers and reduce oil consumption.
- AMSOIL 10W-30 100% Synthetic High-Mileage Motor Oil – Features unique chemistry for vehicles with over 75,000 miles, including boosted detergents and reduced sludge to help older engines last longer.
- WIX Oil Filter – A premium filter with media that offers improvements over original equipment manufacturer (OEM)-branded filters, ensuring clean oil flows through the engine system.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix formulation that protects all cooling system metals, gaskets, and hoses, with protection up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option requiring mixing with distilled water, offering protection up to 150,000 miles or 5 years in passenger cars and light trucks.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Guards against leaks and promotes smooth, shudder-free shifts while resisting harmful sludge.
- AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube – Friction-modified to protect brass synchronizers and inhibit rust, ideal for manual transmissions requiring GL-4 fluids.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip applications and controls thermal runaway in differentials.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Offers advanced protection against wear and helps reduce operating temperatures in high-performance or severe service conditions.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – A heavier viscosity option for limited-slip differentials, protecting against rust and corrosion while extending oil, seal, and equipment life.
The engine oil is the lifeblood of your Mitsubishi Pickup. For the 2.6L 4-cylinder engine, the manufacturer’s specifications recommend a viscosity grade of 10W-30 for general use. The oil filter change is included in the 5.3 quart capacity. After refilling, it is essential to check the oil level and ensure the drain plug is torqued correctly between 44 and 57 ft/lbs to prevent leaks. Synthetic motor oils are highly recommended for this vehicle because they provide superior flow at low temperatures and resist breakdown better than conventional oils, especially if the truck is used for towing or frequent stop-and-go driving.
Essential Fluids for Transmission and Cooling
Proper lubrication extends beyond the engine block. The cooling system requires a robust antifreeze solution to prevent overheating in summer and freezing in winter. The 1985 Mitsubishi Pickup holds 8.5 quarts of coolant. AMSOIL offers both pre-mixed ethylene glycol and concentrated propylene glycol options. The pre-mixed Antifreeze & Coolant is ready to pour and offers excellent protection for 150,000 miles or five years. If you prefer mixing your own, the Propylene Glycol Antifreeze is a concentrated formula that can be tailored to your specific climate needs, offering protection up to 150,000 miles as well.
Transmission maintenance is equally critical for longevity. If your vehicle is equipped with the A904 automatic transmission, the total fill capacity is 7.2 quarts, with an initial fill of 4 quarts. AMSOIL’s Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid and OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid are formulated to handle the rigors of heavy towing and elevated temperatures. For those with manual transmissions, such as the KM132-9 or KM132-E, the fluid requirements differ. Manual units typically require a GL-4 fluid with a capacity of approximately 4.6 to 4.9 pints depending on the specific drive configuration (4WD or RWD). AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube is an ideal choice here, as it protects brass synchronizers and ensures smooth shifting in all temperatures.
Drivetrain and Brake Fluid Recommendations
For the drivetrain, the 1985 Mitsubishi Pickup often utilizes a transfer case and differentials that demand heavy-duty protection. The transfer case (U/K TRC) requires approximately 4.6 pints of lubricant. The fluid specifications can vary based on whether the differential is a standard open unit or a limited-slip (LSD) model. For limited-slip differentials, a specialized gear lube with friction modifiers is required. AMSOIL SEVERE GEAR® Synthetic Gear Lubes in 80W-90, 75W-90, and 75W-110 viscosities are designed to meet these stringent requirements, controlling thermal runaway and protecting against rust and corrosion.
Brake fluid is another often-overlooked but vital fluid. The 1985 model utilizes a DOT 3 hydraulic brake fluid. Over time, brake fluid absorbs moisture from the air, which lowers its boiling point and can lead to brake fade. Replacing it with AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures a stable viscosity over a wide temperature range, providing excellent responsiveness for ABS and traction control systems while maintaining peak braking performance.
About the Vehicle
The 1985 Mitsubishi Pickup is a classic example of Japanese engineering from the mid-1980s, known for blending compact utility with surprisingly capable performance. This generation of the pickup was part of Mitsubishi’s push to bring reliable, fuel-efficient trucks to the American market, competing directly with established domestic models. The 2.6L 4-cylinder engine, often identified by the engine code [E] E, was a powerhouse for its displacement, offering a balance of torque and fuel economy that appealed to both work users and recreational drivers.
Owners of this era of Mitsubishi trucks often cite their durability and simplicity as key selling points. The vehicle’s design emphasized practicality, featuring a straightforward layout that made it accessible for do-it-yourself maintenance—a factor that has kept these trucks on the road for decades. The 2.6L engine, with its single overhead camshaft design, was renowned for its smooth operation and reliability, though it could occasionally be noisy on cold starts. The platform served as a rugged workhorse, capable of handling various tasks from agricultural work to recreational hauling. Despite its age, the 1985 Mitsubishi Pickup retains a dedicated following among enthusiasts who appreciate its unpretentious charm and mechanical simplicity, making it a staple for those who value a vehicle that gets the job done without relying on complex electronics.
Seasonal and Maintenance Products
To keep your 1985 Mitsubishi Pickup in top condition throughout the year, consider additional protective measures. For seasonal storage, AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, preventing varnish and gum buildup. Engine Fogging Oil is ideal for protecting internal components during long periods of inactivity. For regular maintenance, AMSOIL P.i.® Performance Improver Gasoline Additive can restore up to 14% horsepower and clean fuel injectors, ensuring the engine breathes efficiently. Exterior and interior cleaners, such as the Miracle Wash and Silicone Spray, help preserve the vehicle’s appearance and protect rubber components from drying out.
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