The 1998 Subaru Impreza equipped with the 2.2-liter EJ22 engine requires specific attention to fluid maintenance to ensure longevity and optimal performance. This boxer engine, known for its reliability and unique horizontal layout, benefits significantly from high-quality synthetic lubricants that can handle thermal stress and provide superior wear protection. Whether you are driving through heavy city traffic, tackling steep mountain roads, or storing the vehicle for extended periods, using the correct fluids is essential. Proper lubrication extends the life of critical components, reduces maintenance costs, and keeps the vehicle running smoothly for years to come. To achieve this, drivers can rely on AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil, AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil, AMSOIL OE 5W-30 100% Synthetic Motor Oil, or AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil, along with the AMSOIL Oil Filter or WIX Oil Filter for a complete fluid change.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Offers up to 25,000 miles of protection with 75% more engine protection against horsepower loss and wear, making it the top choice for high-mileage or severe service.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Provides 37% more cleaning power to help keep the engine running smoother and longer, with a guaranteed protection interval of 20,000 miles.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – An excellent option that outperforms conventional oils, featuring a formulation that fights sludge and deposits while providing strong protection for turbochargers.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically designed for engines with over 75,000 miles, offering reduced sludge and enhanced cleaning power to restore performance.
- AMSOIL Oil Filter – Delivers filtering efficiency of 99 percent at 20 microns, allowing for lower restriction and greater capacity to capture wear-causing contaminants.
- WIX Oil Filter – A high-performance alternative offering premium media improvements over original equipment manufacturer-branded filters for reliable filtration.
- WIX Air Filter – Uses premium media to offer improvements over OEM-branded filters, ensuring clean airflow for the engine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation providing protection up to 150,000 miles or 5 years, compatible with all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula requiring mixing, designed to exceed OEM standards for corrosion protection in both passenger cars and heavy-duty applications.
- 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 – Promotes smooth, shudder-free shifts and guards against leaks, resisting harmful sludge effectively.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Provides advanced protection against wear and rust, helping to reduce operating temperatures in manual transmissions and differentials.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Offers excellent protection with long oil life and contains friction modifiers ideal for limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – An alternative viscosity option for manual transmissions and differentials that ensures reliable performance across a wide temperature range.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Features excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
- AMSOIL P.i.® Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans fuel injectors to improve fuel economy and prevent carbon buildup.
- AMSOIL Gasoline Stabilizer – Helps keep fuel fresh for up to 12 months, protecting against varnish and ethanol corrosion.
- AMSOIL Engine Fogging Oil – A highly effective rust preventive designed to protect internal engine components during storage.
Proper fluid selection is the cornerstone of vehicle maintenance. The 1998 Subaru Impreza’s 2.2-liter engine is a robust unit, but like all internal combustion engines, it relies on the oil film between moving parts to prevent metal-on-metal contact. Without adequate lubrication, friction generates excessive heat, leading to accelerated wear, sludge accumulation, and potential catastrophic failure. By choosing a high-quality synthetic motor oil, you allow the engine to operate more efficiently, reducing the stress on components like the piston rings and valve train. Furthermore, the extended service intervals offered by AMSOIL synthetic oils mean fewer oil changes over the vehicle’s lifetime, saving time and money while maintaining peak engine cleanliness.
Transmission and Drivetrain Lubrication
The 1998 Impreza’s transmission and final drive systems require precise lubrication to ensure smooth shifting and power delivery. For automatic transmissions, the capacity is 8.9 quarts for a total fill using an automatic transmission fluid that meets the necessary specifications. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is formulated to withstand the rigors of heavy towing and elevated temperatures, providing a reserve of protection during abuse or extreme conditions. Alternatively, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid offers excellent cold-weather performance and guards against leaks while promoting shudder-free shifts.
Manual transmissions and differentials also require specialized care. The 5-speed manual transmission holds 7.4 pints of fluid. For these applications, AMSOIL SEVERE GEAR® 75W-90 provides advanced protection against wear and thermal runaway, making it ideal for limited-slip differentials. For front and rear final drives, particularly in automatic transmission models where the front capacity is 2.5 pints, the AMSOIL SEVERE GEAR® 80W-90 offers robust protection with friction modifiers. The AMSOIL SEVERE GEAR® 75W-110 serves as a versatile option for various gear ratios. These synthetic gear lubes help reduce operating temperatures and extend the life of seals and equipment.
Cooling, Brakes, and Fuel Systems
Maintaining the cooling system is critical for the Subaru boxer engine, which relies on efficient heat dissipation. The 1998 Impreza coolant capacity is 5.8 quarts. Using AMSOIL Passenger Car & Light Truck Antifreeze & Coolant ensures protection for all cooling system metals, gaskets, and hoses, with a unique formulation that eliminates phosphates and borates. For those preferring a concentrated solution, AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers exceptional corrosion resistance and a longer service life.
Brake fluid safety cannot be overlooked. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent responsiveness for ABS and traction control systems, maintaining stable viscosity even under extreme heat. For the fuel system, AMSOIL P.i.® Performance Improver Gasoline Additive helps clean fuel injectors and restore lost horsepower, while the AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor lubricates the fuel system and upper cylinders to prevent corrosion and wear.
Additional Maintenance Products
To keep the 1998 Impreza in top condition, air filtration is vital. The WIX Air Filter features premium media that outperforms OEM standards, ensuring clean air intake for better combustion. For cleaning, AMSOIL Power Foam® Carburetor and Induction-System Cleaner removes stubborn deposits, while AMSOIL Brake and Parts Cleaner safely cleans components without leaving residue. For general vehicle care, products like AMSOIL Miracle Wash Waterless Wash and Wax Spray allow for a quick, protective shine, and AMSOIL Engine Fogging Oil protects internal components during long-term storage.
About the Vehicle
The 1998 Subaru Impreza occupies a unique and beloved spot in automotive history. This model represents a period when Subaru was solidifying its reputation for building durable, all-weather capable vehicles that prioritized driver engagement and safety. The 2.2-liter EJ22 engine, the subject of this guide, is a naturally aspirated four-cylinder engine known for its robustness and ability to handle a variety of driving conditions. Unlike the turbocharged models that dominate the rally scene, the naturally aspirated version offers a smoother, quieter, and highly reliable daily driving experience that has stood the test of time.
Subaru’s iconic symmetrical all-wheel-drive system, introduced earlier in the brand’s lineup, was fully integrated into the Impreza chassis by 1998. This system provides superior traction and stability, making the car an excellent choice for owners who encounter snow, rain, or uneven road surfaces regularly. The boxer engine layout, where the cylinders are horizontally opposed, not only lowers the vehicle’s center of gravity for better handling but also reduces vibration, contributing to a refined ride quality. While the 1998 model year predates the modern WRX STI’s global dominance, it laid the groundwork for the rally heritage the brand is celebrated for today. Owners of this era of Imprezas often appreciate the simplicity of the non-turbo mechanical components, the durability of the all-wheel-drive system, and the car’s ability to remain functional and reliable well into the high-mileage years. It is a vehicle that rewards consistent maintenance and thoughtful care, offering a rewarding driving experience for enthusiasts and practical commuters alike.