Maintaining the 1987 Mitsubishi Galant with a 2.4-liter 4-cylinder engine requires precision when selecting lubricants. This classic vehicle, often found in daily driver or enthusiast circles, relies on proper oil viscosity and high-quality filters to ensure longevity. Because the engine was designed decades ago, modern AMSOIL Synthetic Motor Oils provide a distinct advantage by offering superior protection against wear, heat, and sludge buildup that older conventional oils might not prevent. Ensuring the correct fluid specifications are met helps preserve the engine’s performance and extends the service intervals for owners who want to keep their Galant running smoothly for years to come.
Recommended AMSOIL Products
- AMSOIL Signature Series 10W-30 100% Synthetic Motor Oil – Offers 75% more engine protection against horsepower loss and wear, with a guaranteed protection interval of up to 25,000 miles or one year.
- AMSOIL Extended-Life 10W-30 100% Synthetic Motor Oil – Provides 37% more cleaning power to keep the engine running smoother and longer, with guaranteed protection for 20,000 miles.
- AMSOIL OE 10W-30 100% Synthetic Motor Oil – A budget-friendly 100% synthetic option that fights sludge and deposits, ensuring reliable engine care.
- AMSOIL 10W-30 100% Synthetic High-Mileage Motor Oil – Formulated for vehicles with over 75,000 miles to boost detergents, enhance anti-wear additives, and reduce sludge by 67%.
- WIX Oil Filter – A premium filter with media improvements over original equipment manufacturer branded filters to ensure clean oil circulation.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Protects against wear, resists sludge, and promotes smooth, shudder-free shifts in automatic transmissions.
- AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube – Protects against increased heat and pressure, featuring excellent cold-flow properties and brass synchronizer protection for manual gearboxes.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A ready-to-use 50/50 pre-mix that protects cooling system metals, gaskets, and hoses for up to 150,000 miles or five years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant option requiring mixing with distilled water, offering protection up to 150,000 miles or five years for passenger cars.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
Engine Oil and Filtration Recommendations
The heart of your 1987 Mitsubishi Galant is the 2.4-liter 4-cylinder engine, identified by the engine code [L]. To ensure optimal performance, the engine oil capacity is 4.2 quarts when performed with a filter change. After refilling, it is critical to check the oil level to ensure the correct volume is present. The drain plug torque should be set between 26 and 32 ft/lbs during service. While the engine can operate with various viscosities depending on ambient temperature, AMSOIL Signature Series 10W-30 stands out as the top choice. It provides superior protection against horsepower loss and wear, with the industry’s best protection against sludge. If your vehicle has accumulated significant mileage, the AMSOIL 10W-30 High-Mileage Motor Oil is an excellent alternative. Its unique chemistry is designed specifically for engines with over 75,000 miles, boosting the detergent package to reduce sludge by 67% and helping the engine perform better over the long haul.
The filtration system is just as vital as the oil itself. For this vehicle, the WIX Oil Filter is recommended. This filter features premium media that offers improvements over standard OEM-branded filters, ensuring that contaminants are effectively captured to keep the engine clean. By combining a high-quality synthetic oil with a superior filter, you create a robust protection system that helps the engine run smoother and last longer.
Transmission and Gear Lubrication
The transmission system of the 1987 Galant requires specific attention to fluid selection, whether it is equipped with a manual or automatic gearbox. For automatic transmissions, the fluid capacity for a total fill on the KM175-1 model is 6.1 quarts, with an initial fill capacity of 4.2 quarts. To protect this system, AMSOIL Signature Series Multi-Vehicle Automatic Transmission Fluid is a top-tier option. It remains fluid in sub-zero temperatures and provides reserve protection during heavy use, making it ideal for severe driving conditions.
Alternatively, for a more budget-conscious approach that still delivers synthetic performance, AMSOIL OE Multi-Vehicle Automatic Transmission Fluid offers excellent protection against wear and harmful sludge. It promotes smooth, shudder-free shifts and guards against leaks, ensuring the transmission operates efficiently. For those with a manual transmission, specifically the KM210-0 (5-speed) model, the capacity is 5.3 pints. The AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube is the recommended choice. It inhibits rust and corrosion while protecting brass synchronizers and seals, ensuring long service life even under increased heat and pressure.
Cooling System and Brake Fluids
Proper cooling is essential for the longevity of any engine. The 1987 Mitsubishi Galant requires 7.4 quarts of coolant for the system. For optimal protection, AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a convenient 50/50 pre-mix formulation. It is engineered to exceed original equipment requirements and protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or five years.
If you prefer to mix your own coolant, AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a concentrated option that requires mixing with distilled water. It greatly surpasses standards for metallic corrosion and erosion, making it suitable for extreme conditions. Regarding the braking system, which utilizes DOT 3 hydraulic brake fluid, AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent responsiveness. It maintains stable viscosity across a wide temperature range, ensuring reliable braking performance whether the vehicle is sitting in winter or driving in summer heat.
About the Vehicle
The 1987 Mitsubishi Galant represents a significant era in Japanese automotive history, embodying the reliability and efficiency that defined the brand during the 1980s. Produced by Mitsubishi Motors, this model was part of a lineage that aimed to compete directly with other popular compact sedans in the North American market. The specific iteration with the 2.4-liter 4-cylinder engine (engine code [L]) was a workhorse, favored by owners for its durability and straightforward mechanical design. Unlike the high-strung sport sedans of the time, the Galant focused on providing a smooth, comfortable ride suitable for daily commuting and family transport.
Under the hood, the 2.4-liter engine was known for its robustness, offering ample torque for a car of its size. While it did not possess the raw horsepower of a performance coupe, it was praised for its ability to run reliably over long distances. The platform shared with other Mitsubishi models of the era contributed to its reputation for mechanical simplicity, making it a vehicle that was relatively easy to maintain for enthusiasts and mechanics alike. The interior design reflected the practical aesthetic of the mid-80s, with an emphasis on functionality and spaciousness for a compact sedan. Its market position was solid, appealing to buyers who prioritized fuel economy and reliability over flashy styling cues.
Over the decades, owners have noted specific characteristics that require attention as the vehicle ages. One common issue often found in these older engines is the buildup of sludge and deposits within the oil passages. This can occur due to the breakdown of conventional oils over time, leading to poor lubrication and potential wear. Using high-quality synthetic oils like those from AMSOIL can significantly mitigate this issue, keeping the engine internals cleaner and reducing the risk of sludge-related failures. Another prevalent concern involves oil consumption in high-mileage vehicles. As seals harden and wear over the years, engines may begin to burn oil, leading to frequent top-offs and potential smoke from the exhaust. Specialized high-mileage formulations help condition these seals and reduce consumption, extending the interval between maintenance. Additionally, the cooling system on these vintage sedans can be susceptible to corrosion and rust if the coolant is not changed regularly, which can lead to overheating issues. Modern antifreeze formulations provide better corrosion inhibition to prevent this degradation of the cooling components. Finally, transmission shifting can become sluggish or noisy if the fluid breaks down or becomes contaminated. Regular fluid changes with synthetic transmission fluids ensure that the clutch packs and synchronizers continue to engage smoothly, preventing premature wear on the gearbox components.
For the owner of a 1987 Galant, keeping it on the road today requires a blend of respecting its original design while utilizing modern chemical solutions to overcome the effects of time. By selecting the right lubricants, you are not just changing fluids; you are investing in the continued performance and reliability of a classic machine. Whether you are driving it on weekends or using it as a reliable daily driver, the proper maintenance regime ensures that this Mitsubishi Galant continues to serve you well.