The 1998 Chrysler Concorde with the 2.7L V6 engine represents a specific era of Chrysler engineering that prioritized power and performance. Owners of this model know that the 2.7L engine, often referred to as the “EER” code, is capable but requires precise maintenance to avoid common issues related to oil consumption and sludge buildup. Because this engine operates with tight tolerances and high heat characteristics, using the correct lubricants is not just a recommendation—it is essential for longevity. Proper fluid selection ensures that critical components, from the piston rings to the valve train, receive adequate protection against wear, corrosion, and thermal breakdown.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The premier choice for this engine, offering 75% more protection against horsepower loss and wear while supporting extended drain intervals up to 25,000 miles.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Provides superior cleaning power to reduce sludge and deposits, with a guaranteed 20,000-mile protection interval for regular drivers.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective synthetic option designed to fight sludge and deposits while outperforming conventional oils and meeting original equipment standards.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Ideally suited for Concorde engines over 75,000 miles, featuring a unique chemistry to reduce leaks, sludge, and oil consumption.
- AMSOIL Oil Filter – Engineered to provide 99% filtration efficiency at 20 microns and a larger capacity for contaminants than competing filters to maximize engine life.
- WIX Oil Filter – A premium aftermarket alternative that offers improved media and construction over original equipment manufacturer-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed ethylene glycol solution that protects cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated non-toxic alternative that requires mixing with water, offering protection up to 150,000 miles in passenger cars.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing, high temperatures, and harsh terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Guarantees excellent cold-weather performance and smooth, shudder-free shifts for the 42LE transmission.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – The top recommendation for the front differential, controlling thermal runaway and protecting limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – An excellent alternative for the front differential, offering superior protection against rust, corrosion, and extreme pressure.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – A versatile synthetic gear lube that provides long oil and seal life for the differential.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers excellent responsiveness for ABS and traction control systems with a stable viscosity across a wide temperature range.
Maintaining the 1998 Chrysler Concorde’s 2.7L engine involves more than just changing the oil; it requires a comprehensive approach to lubrication that addresses the unique demands of this vehicle. The engine, while robust, is sensitive to the quality of the oil it burns. Using a full synthetic motor oil like the AMSOIL Signature Series 5W-30 ensures that the engine is protected from the moment of startup. This specific viscosity grade, 5W-30, is critical for the EER engine code to maintain proper oil pressure and film strength across all operating temperatures. The 2.7L engine benefits significantly from the enhanced detergent packages found in synthetic oils, which help keep the valvetrain clean and prevent the sludge that can clog oil galleries over time.
When performing a fluid service, it is vital to adhere to the specific capacity requirements of the vehicle. The 2.7L engine holds 5.0 quarts of motor oil when a filter change is included. After refilling, owners should always check the oil level to ensure accuracy, as overfilling or underfilling can lead to significant mechanical issues. For the air intake system, while the primary filter is often replaced during routine service, ensuring the engine breathes freely contributes to the longevity of the internal components. The oil drain plug torque specification is critical and should be tightened to exactly 20 ft/lbs to prevent leaks or damage to the drain pan threads.
For vehicles with over 75,000 miles, the 1998 Concorde’s engine may benefit from the AMSOIL High-Mileage 5W-30 Motor Oil. This formulation includes enhanced anti-wear additives and boosted detergents that specifically target the needs of older engines, reducing sludge by up to 67% and helping to slow oil consumption. This product is particularly valuable for maintaining compression and ensuring smooth operation in higher-mileage examples of this model.
The cooling system is another area where precision is key. The 1998 Chrysler Concorde requires a coolant capacity of 7.9 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed 50/50 formulation that offers protection against corrosion for up to 150,000 miles. It is phosphate-, nitrate-, and silicate-free, making it compatible with all cooling system metals, including aluminum heads which are present in the 2.7L engine. For those who prefer to mix their own, the concentrated Propylene Glycol Antifreeze provides a non-toxic alternative with excellent freeze and boil-over protection.
Transmission maintenance is often overlooked but is crucial for the 42LE automatic transmission found in this vehicle. The total fill capacity is 9.9 quarts, though the initial fill is only 4.5 quarts. The AMSOIL Signature Series Multi-Vehicle Automatic Transmission Fluid is designed to handle the rigors of the 1998 Concorde, providing resistance to shear and maintaining viscosity even under high loads. Alternatively, the OE Multi-Vehicle fluid offers a cost-effective solution that promotes smooth, shudder-free shifts, essential for the smooth ride this sedan is known for.
The differential in the front-wheel-drive chassis requires specific gear lubrication. The 1998 Concorde’s front differential holds 1.9 pints of fluid. AMSOIL recommends the SEVERE GEAR 75W-90 Synthetic Gear Lube for its advanced protection against wear and rust. This fluid contains friction modifiers specifically beneficial for limited-slip applications, ensuring the differential operates quietly and efficiently. The 75W-110 and 80W-90 variants are also available as high-performance alternatives depending on specific driving conditions or environmental factors.
Finally, the braking system benefits from the use of AMSOIL DOT 3 and DOT 4 Synthetic Brake Fluid. This fluid ensures excellent ABS and traction-control responsiveness by maintaining a stable viscosity regardless of temperature fluctuations. It is compatible with the hydraulic brake systems of the 1998 Concorde, providing a safe and reliable stopping power. Regular replacement of brake fluid helps prevent moisture accumulation, which can lead to corrosion inside brake lines and reduced braking efficiency.
Model History and Performance
The 1998 Chrysler Concorde stands as a significant chapter in the history of American full-size sedans. Introduced in the early 1990s, the Concorde was Chrysler’s flagship model, designed to compete directly with the Ford Taurus and the Chevrolet Impala. By 1998, the model had evolved into a mature, refined vehicle known for its smooth ride quality and spacious interior. The second generation, which began in 1993, moved the Concorde to Chrysler’s prestigious LH platform, a chassis engineering marvel that placed the engine forward of the front axle to maximize cabin space and improve handling dynamics.
The specific 2.7-liter V6 engine, codenamed EER, was a unique powerplant that set the Concorde apart from its competitors. This engine was derived from the successful 2.5-liter V6 but was bored out to 2.7 liters, resulting in 150 horsepower. It featured a dual overhead camshaft design and variable valve timing, which was a technological advancement for its time. While the 2.7L engine offered spirited acceleration for a sedan of its class, it also became a subject of intense scrutiny among owners regarding oil consumption. Despite this, the driving character of the 1998 Concorde was defined by comfort, quietness, and a solid build quality that earned it high reliability ratings for its era, particularly in the context of the 90s American automotive landscape.
Ownership of a 1998 Concorde today appeals to those who appreciate a blend of classic American sedan design and modern durability. The vehicle’s legacy is one of comfort and utility, offering a roomy cabin that remains a benchmark for rear-seat legroom. As these vehicles age, the importance of using high-quality synthetic fluids cannot be overstated. Proper lubrication not only extends the life of the powertrain but also preserves the refined driving experience that made the Concorde a household name. Whether for daily driving or as a reliable classic, keeping the Concorde well-maintained with premium AMSOIL products ensures it continues to perform with the poise it was designed to offer.