The 2008 Chrysler Aspen equipped with the robust 5.7L Hemi V8 is a powerful full-size SUV capable of handling heavy loads, towing, and challenging terrain. To keep this engine and its complex drivetrain performing at peak levels, using the correct synthetic lubricants is essential. Regular maintenance with high-quality fluids minimizes wear, reduces operating temperatures, and extends the service life of critical components. Whether you are driving in extreme heat, freezing cold, or engaging in severe off-road activity, the right lubricants provide a protective barrier that standard oils cannot match.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – Offers the highest level of protection with an extended 25,000-mile change interval, ensuring maximum horsepower retention and minimal wear for the 5.7L Hemi.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – Delivers 20,000 miles of protection with superior cleaning power to keep the engine running smoothly for a longer duration.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – A cost-effective synthetic option that fights sludge and deposits while meeting OEM specifications.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, featuring enhanced anti-wear additives and reduced sludge.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns, reducing engine wear by capturing contaminants that standard filters miss.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed ethylene glycol formulation that protects against corrosion and boil-over for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that delivers extreme protection for the cooling system, compatible with all engine metals.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and high temperatures, remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – An excellent choice for standard driving, promoting smooth, shudder-free shifts and protecting against leaks.
- WIX Transmission Filter – Features premium media that offers improvements over original equipment manufacturer-branded filters for better fluid flow.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – Ideal for the front differential, providing advanced protection against wear and controlling thermal runaway.
- AMSOIL SEVERE GEAR 75W-140 100% Synthetic Gear Lube – The superior choice for the rear standard and limited-slip differentials, reducing operating temperatures and extending oil life.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range.
- AMSOIL P.i. Performance Improver Gasoline Additive – Restores horsepower by cleaning fuel injectors and preventing carbon buildup for better fuel economy.
Maintaining your Chrysler Aspen with these specific fluids ensures that every moving part in your vehicle operates with minimal friction. The 5.7L Hemi engine benefits significantly from synthetic oils that resist shear and breakdown, maintaining viscosity during high-stress loads. By adhering to the recommended service intervals and fluid types, you can maximize the longevity of your engine, transmission, and drivetrain components.
Engine Oil and Filter Recommendations
For the 5.7L 8-cylinder engine, the required oil viscosity is 5W-20. The system holds approximately 7.0 quarts, including the filter replacement. The oil drain plug torque specification is 25 ft/lbs. After refilling, it is crucial to check the oil level to ensure proper operation.
AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil is the premium choice for this application. It provides 75% more engine protection against horsepower loss and wear compared to conventional oils. This fluid guarantees protection for up to 25,000 miles or one year, making it ideal for drivers who push their SUV to the limit. If you prefer a slightly lower-cost option without sacrificing synthetic benefits, the AMSOIL Extended-Life 5W-20 offers 20,000 miles of protection with superior cleaning power. For those with higher mileage vehicles, the AMSOIL 5W-20 High-Mileage Motor Oil contains boosted detergent packages that reduce sludge by 67%, helping older engines perform better.
The filtration system is equally critical. The AMSOIL Oil Filter (EAO11) is designed to provide 99% filtration efficiency at 20 microns. It allows lower restriction, keeping engine parts lubricated, and offers greater capacity for small, wear-causing contaminants than competing filters. This extended service life means the filter performs effectively throughout the extended oil change intervals of the AMSOIL oils. If you are not comfortable with extended intervals, a WIX Oil Filter is also a compatible high-quality option that offers improvements over standard OEM filters.
Automatic Transmission Fluid and Filters
The 2008 Chrysler Aspen 5.7L is equipped with a 5-speed 545RFE automatic transmission. For the 4WD models, the total fill capacity is 14.1 quarts, while the initial fill requires approximately 6.6 quarts. For 2WD models, the initial fill is around 5.5 quarts. Using a synthetic transmission fluid is vital for preventing shudder, maintaining smooth shifts, and protecting against high operating temperatures.
AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is engineered to withstand the rigors of heavy towing and elevated temperatures. It remains fluid in sub-zero conditions and provides reserve protection during heavy use, ensuring the transmission responds quickly and accurately. The AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is an excellent alternative that protects against wear and resists harmful sludge while promoting shudder-free shifts. When performing a transmission service, replacing the filter is essential to remove metallic particles and sludge. The WIX Transmission Filter (58843) features premium media that offers superior flow and filtration compared to stock filters, ensuring clean fluid circulates through the valve body and torque converter.
Coolant and Cooling System Protection
The cooling system for the 2008 Chrysler Aspen with an auxiliary heater has a capacity of 16.7 quarts. Maintaining the correct mixture is critical to prevent freezing, boiling, and corrosion within the aluminum engine block and radiator. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that exceeds OEM requirements. It is designed to protect all cooling system metals, gaskets, and hoses while remaining phosphate, nitrate, and nitrite-free. This formulation allows for use in a wide variety of vehicles and protects up to 150,000 miles or 5 years. For those who prefer a concentrated solution, AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides superior protection against corrosion and erosion, greatly surpassing industry standards.
Differential and Transfer Case Lubrication
Proper lubrication of the front and rear differentials, as well as the transfer case, is essential for the four-wheel-drive system. For the front differential (GL-5, 75W-90), the capacity is 3.4 pints. AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube offers advanced protection against wear and helps reduce operating temperatures. It contains friction modifiers suitable for limited-slip applications.
The rear differential requires different viscosities depending on the configuration. For the standard rear differential with a 9.25 ring gear, the capacity is 4 pints, and AMSOIL SEVERE GEAR 75W-140 is recommended. For limited-slip differentials, the same 75W-140 viscosity is used, though a specific Mopar limited-slip additive may be required by the manufacturer’s notes. The transfer case also requires specific attention; the NV144 unit holds 1.9 pints, and the NV244 GENII holds 3.4 pints. For these units, AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid or SEVERE GEAR fluids can be used depending on the specific service manual requirements, ensuring smooth power transfer from the engine to the wheels.
Brake Fluid and Performance Additives
The brake system on the Aspen utilizes hydraulic brake fluid meeting DOT 3 and DOT 4 specifications. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent ABS and traction-control responsiveness. Its stable viscosity over a wide temperature range ensures consistent braking performance in all conditions. Additionally, to maintain peak engine performance, AMSOIL P.i. Performance Improver Gasoline Additive is recommended. It restores up to 14% horsepower and cleans fuel injectors to a 100% flow rate, improving fuel economy and reducing the need for higher-octane fuel.
About the Vehicle
The 2008 Chrysler Aspen represents a significant moment in American automotive history, serving as the luxury counterpart to the Dodge Durango during a period of transition for Chrysler’s full-size SUV lineup. Based on the DG platform, the Aspen shared its mechanical underpinnings with the Dodge and Jeep Grand Cherokee models, known for their ruggedness and capability. The 5.7L Hemi V8 engine, featured in this guide, was a cornerstone of Chrysler’s lineup, celebrated for its combination of accessible torque and high horsepower output. This engine was a revival of the legendary Hemi nameplate, bringing modern variable valve timing and direct fuel injection technology to a classic big-block design.
Owners of the 2008 Aspen often cite its spacious interior and commanding road presence as primary selling points. The vehicle was designed to compete with top-tier full-size SUVs, offering a blend of on-road comfort and off-road capability that appealed to families and recreational users alike. The 4WD systems, featuring advanced transfer cases, allowed for confident driving in adverse weather conditions and light off-road trails. While the Aspen line was eventually discontinued as Chrysler shifted focus toward more fuel-efficient crossovers and electric vehicles, the 2008 model remains a favorite among enthusiasts for its potent engine options and solid build quality. The robust nature of this vehicle means it requires high-performance lubricants to maintain its power and longevity, particularly for those who utilize the SUV for towing or heavy hauling.
Additional Maintenance Products
Beyond the core lubrication needs, keeping your Aspen in top condition involves using specialized maintenance products. AMSOIL Synthetic Multi-Purpose Grease is ideal for chassis points, offering resistance to thermal degradation and excellent load-carrying performance. For engine bay cleaning, AMSOIL Engine Degreaser provides a professional-strength formula that quickly removes the toughest grease and grime. Exterior care can be handled with AMSOIL Miracle Wash Waterless Wash and Wax Spray, which leaves a protective finish and repels dust. For storage periods, AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, preventing varnish and gum buildup in the fuel system.