The 2012 Mitsubishi Eclipse with the 3.8-liter V6 engine is a performance coupe that demands lubricants capable of handling high thermal loads and the unique stresses of its naturally aspirated powerplant. While this vehicle does not feature a turbocharger like some of its siblings, the 6G75 engine produces significant horsepower that generates substantial heat within the engine block. Using the correct viscosity and a high-quality synthetic oil ensures that critical components remain lubricated even under spirited driving or extended highway commutes.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The premier choice for maximum protection, offering up to 25,000 miles of service and superior resistance to thermal breakdown.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – An excellent option for drivers seeking extended intervals up to 20,000 miles while maintaining strong engine cleaning power.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – Designed to outperform conventional oils and OEM standards, this formulation fights sludge and deposits while meeting specific performance requirements.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce leaks and sludge while restoring engine performance.
- AMSOIL Oil Filter – Provides 99% efficiency at 20 microns, offering greater capacity for contaminants and reduced restriction compared to standard filters.
- WIX XP Oil Filter – Features premium media that outperforms many original equipment manufacturer filters for superior flow and filtration.
- WIX Oil Filter – A reliable aftermarket choice that offers premium media for improved filtration efficiency and engine protection.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An ethylene glycol-based formula that protects cooling system metals and extends service intervals up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, non-toxic option that offers exceptional protection against corrosion and erosion, suitable for a wide range of operating conditions.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing and high temperatures while maintaining fluidity in extreme cold for smoother shifts.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Provides excellent cold-weather performance and guards against sludge and leaks for long-term transmission health.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures consistent pedal feel and superior ABS responsiveness with a high boiling point for enhanced safety.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and keeps seals soft to prevent leaks, ensuring quiet and responsive steering operation.
Understanding the specific lubrication needs of the 2012 Mitsubishi Eclipse is the first step in maintaining its longevity. This vehicle, powered by the 3.8-liter 6G75 engine, requires a precise oil change protocol to ensure the engine remains healthy. The manufacturer specifies a 5W-20 viscosity as the preferred grade for this engine, particularly when operating in temperatures below 38°C. The oil capacity is listed at 4.5 quarts when the filter is also being replaced. It is crucial to adhere to these specifications to avoid overfilling or underfilling, which can impact engine performance and efficiency.
When changing the oil, the torque specification for the oil drain plug should be between 26 and 32 ft/lbs. After refilling, it is essential to check the oil level to ensure the correct volume has been added. Regular maintenance using high-quality synthetic oils allows you to extend the time between oil changes significantly compared to conventional oils, reducing the frequency of visits to the shop and the long-term cost of ownership.
Engine Oil and Filtration Essentials
The heart of the 2012 Eclipse’s performance is its engine, which relies on a steady stream of clean, properly lubricating oil. The AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil is an industry-leading synthetic formulation designed to provide the highest level of protection available. It offers superior resistance to thermal oxidation and shear stability, which is vital for the 3.8L V6 as it operates under various driving conditions. This oil helps reduce horsepower loss and wear, ensuring the engine stays sharp for thousands of miles.
For drivers who prefer a slightly lower price point but still demand full synthetic performance, the AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil is a robust alternative. It is engineered to clean the engine, with 37% more cleaning power than standard oils, helping to keep the engine running smoother for longer. If your vehicle has accumulated over 75,000 miles, the AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil offers unique chemistry with boosted detergents and dispersants to combat sludge and reduce wear.
However, even the best oil cannot protect the engine if contaminants are allowed to circulate. This is where the filtration system comes into play. The AMSOIL Oil Filter is rated for 99% filtration efficiency at 20 microns, capturing small wear-causing contaminants that standard filters might miss. It also features a lower restriction design, ensuring that oil flow is never impeded, even in cold starts. Alternatively, the WIX XP Oil Filter is a premium aftermarket option that rivals original equipment performance, utilizing advanced media to trap dirt and debris effectively.
Transmission and Chassis Fluids
Moving beyond the engine, the automatic transmission in the 2012 Eclipse requires specific attention to maintain smooth shifting and prevent premature wear. The vehicle’s automatic transmission has a total fill capacity of 8.9 quarts for the F5A5A-4 model. Using a fluid designed for severe service is highly recommended. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is an excellent choice, formulated to withstand the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
For those seeking a more budget-friendly synthetic option, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid delivers outstanding protection against wear and sludge. It promotes smooth, shudder-free shifts and guards against leaks, ensuring the transmission operates quietly and efficiently. The fluid’s synthetic base stock provides better viscosity stability than conventional fluids, extending the life of the transmission components.
Braking and steering systems also rely on high-quality fluids to function safely. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is designed for excellent ABS and traction-control responsiveness. It provides a stable viscosity over a wide temperature range, ensuring that the brake pedal feels consistent whether you are driving in hot summer weather or cold winter conditions. Similarly, the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid reduces friction and helps seals remain soft, which is critical for preventing leaks in older vehicles and ensuring quiet, smooth steering operation.
Coolant and Fluid Management
Proper cooling system maintenance is essential for the longevity of the Mitsubishi Eclipse’s engine. Depending on the transmission type (Automatic or Manual), the capacity varies slightly, ranging from 8.5 to 8.6 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed ethylene glycol solution that provides protection up to 150,000 miles. It is free of phosphates, nitrates, and other additives that can be harmful to cooling system components, making it compatible with all other antifreeze colors.
If you prefer a concentrated formulation that offers greater flexibility in mix ratios, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is an exceptional choice. This non-toxic fluid provides protection up to 150,000 miles in passenger cars and light trucks. It greatly surpasses standards for metallic corrosion and erosion, ensuring that the cooling system remains free of deposits and rust. Using a high-quality coolant helps maintain optimal engine temperature, which is crucial for peak performance and fuel efficiency.
Regular maintenance extends beyond just the oil and filters. The AMSOIL P.i.® Performance Improver is a fuel system cleaner that can restore up to 14% horsepower and improve fuel economy by cleaning carbon deposits from fuel injectors and combustion chambers. This additive is particularly beneficial for gasoline direct injection (GDI) engines, helping to maintain peak efficiency and reduce the need for costly repairs. For vehicles that will be stored for extended periods, the AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup that can clog fuel systems.
About the Vehicle
The 2012 Mitsubishi Eclipse represents the final chapter of the fourth generation of this iconic sports coupe, which was produced from 2006 to 2012. Known for its distinctive “Dynamic Shield” front-end design, the Eclipse has always been a favorite among enthusiasts for its bold styling and engaging driving dynamics. The 3.8-liter V6 engine, known as the 6G75, was the top-tier powertrain for the model, replacing the previous 3.0-liter V6. This larger displacement engine provided ample power for overtaking and spirited driving on winding roads, delivering a smooth and linear power delivery that many drivers found superior to the high-revving four-cylinder options available in the base model.
Positioned in the sport coupe segment, the Eclipse competed directly with vehicles like the Ford Mustang and Dodge Charger, though it offered a distinctively Japanese engineering perspective with a focus on reliability and durability. The platform shared some underpinnings with Mitsubishi’s sedan lineup but was tuned for a more dynamic experience, featuring a sport-tuned suspension and a responsive steering system. Despite the absence of a turbocharger in the 3.8L version, the naturally aspirated engine was celebrated for its robustness and ability to handle high RPMs without the complexity of forced induction. The Eclipse’s interior, while practical, prioritized driver-focused ergonomics with supportive seats and clear instrumentation, creating a cockpit feel that made driving enjoyable for daily commutes or weekend outings. This model year marked the end of an era, as Mitsubishi eventually retired the Eclipse badge in 2012 to focus on other segments of the market, making these vehicles particularly interesting to collectors and enthusiasts who appreciate the blend of style and substance that defined the final years of this legendary coupe.