Ensuring your 2007 Chrysler 300 with the powerful 6.1L Hemi V8 remains in peak condition requires more than just a routine visit to the garage. It demands precision when it comes to selecting the right lubricants. The 6.1L engine is known for its immense torque and high-performance capabilities, but like any internal combustion engine, its longevity depends entirely on the quality of fluids circulating through its components. Using the correct viscosity and formulation helps manage heat, minimize friction, and protect critical parts from the unique wear patterns associated with this specific platform.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-40 100% Synthetic Motor Oil – The top-tier choice for this engine, offering 75% more protection against horsepower loss and wear while supporting extended drain intervals up to 25,000 miles.
- AMSOIL Oil Filter – Engineered to filter 99 percent of contaminants at 20 microns, this filter provides superior capacity for small, wear-causing particles compared to standard filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A phosphate- and silicate-free OAT formulation designed to protect all cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing and elevated temperatures while ensuring smooth shifts and remaining fluid in sub-zero conditions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides a stable viscosity over a wide temperature range for excellent ABS and traction-control responsiveness.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Ideal for the front differential, offering advanced protection against wear and thermal runaway with friction modifiers for limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Recommended for rear differentials, controlling operating temperatures and extending the life of seals and equipment.
Engine Oil and Filtration
The 6.1L “Hemi” engine found in the 2007 Chrysler 300 is a naturally aspirated powerhouse. Because of its displacement and aggressive valve train, it generates significant heat and requires an oil that maintains its viscosity under load. The recommended viscosity for all temperature ranges in this application is 0W-40. This grade ensures quick lubrication upon cold starts while maintaining a protective film thickness at operating temperatures.
The engine capacity is 7.0 quarts when performing a change with a filter replacement. After refilling the system, it is crucial to check the oil level to ensure accuracy. The drain plug torque specification is 20 ft/lbs. For filtration, the AMSOIL Oil Filter is the superior choice, as it allows lower restriction than competing brands. This reduced restriction keeps engine parts fully lubricated by ensuring oil flow is not impeded, and it offers a greater capacity for the small, wear-causing contaminants that accumulate over time. An alternative filter available is the WIX Oil Filter, which also offers premium media improvements over original equipment manufacturer-branded filters.
Transmission and Fluid Maintenance
Transmission health is just as critical as engine health. For the 2007 Chrysler 300 with the 6.1L engine, the transmission is the 5-speed NAG1. The total fill capacity for the NAG1 is 8.1 quarts, while the initial fill capacity is 5.3 quarts. The factory recommends ATF+4 fluid. AMSOIL offers two excellent synthetic options for this application.
The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures, providing reserve protection during heavy use. For owners seeking a high-performance option that protects against wear, resists sludge, and promotes smooth, shudder-free shifts, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is an excellent alternative. It guards against leaks and is an ideal choice for maintaining the smooth operation of the NAG1 transmission.
Differential and Axle Lubrication
The rear axle differential on the 6.1L 300 requires specific attention due to the varying gear sizes and limited-slip requirements. The front differential is a 175mm FIA unit requiring a GL-5, 75W-90 synthetic oil, with a capacity of 1.3 pints. For this application, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube is highly recommended. It controls thermal runaway and contains friction modifiers specifically for limited-slip applications.
The rear differential comes in various sizes, including 198mm, 210mm, and 215mm, all of which require a 75W-140 GL-5 synthetic fluid. The capacities are 3 pints for the 198mm unit and 3.4 pints for the 210mm and 215mm units. To ensure maximum protection for these components, the AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube is the optimal choice. This heavy-duty lubricant helps reduce operating temperatures and provides long oil, seal, and equipment life, making it ideal for the high-torque output of the Hemi engine.
Cooling System and Brake Fluid
The cooling system on the 2007 Chrysler 300 requires a substantial amount of fluid, with a total capacity of 15.2 quarts. Maintaining the correct AMSOIL Passenger Car & Light Truck Antifreeze & Coolant mixture is vital to prevent overheating and corrosion. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mixed ethylene glycol formulation that is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free. This unique OAT formulation protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
For the braking system, the hydraulic brake fluid must meet MS-4574 specifications. The recommended fluid is a DOT 3 type. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent responsiveness for ABS and traction control systems. Its stable viscosity over a wide temperature range ensures that the brakes perform reliably in both freezing winters and hot summer stops.
Additional Maintenance Products
Beyond the primary fluids, several additional products can enhance the performance and longevity of your 2007 Chrysler 300. Air filtration is a key factor in engine performance; the WIX Air Filter offers premium media that improves upon OEM standards. For long-term storage, the AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, preventing varnish and gum buildup, while the AMSOIL Engine Fogging Oil protects internal components from rust during inactivity.
To restore lost performance, the AMSOIL P.i.® Performance Improver Gasoline Additive is a powerful tool. It can restore up to 14% horsepower and cleans GDI fuel injectors back to 100% flow rate after a single tank. For those who enjoy the car’s power, adding this additive regularly helps control pre-ignition knock and improves fuel economy.
About the Vehicle
The 2007 Chrysler 300, particularly the SRT-8 model equipped with the 6.1-liter Hemi V8, is widely regarded as one of the most compelling American performance sedans of the late 2000s. Born during the era when DaimlerChrysler was still under the stewardship of the German automotive giant (before the sale to Cerberus), the 300 represented a bold reinvention for Chrysler. It brought the bold, muscular aesthetic of the 1960s 300M and the classic “Forward Look” back to the forefront, but with modern engineering and safety features.
Powered by the legendary 6.1-liter Hemi, this vehicle delivers a distinctively American driving experience. The engine produces approximately 425 horsepower and 420 lb-ft of torque, providing immediate and explosive acceleration that puts many European luxury sports sedans to the test. The 6.1L engine is famous for its deep, aggressive sound and its ability to serve as both a daily driver and a track-capable machine. The suspension is tuned for a blend of comfort and sporty handling, allowing the heavy sedan to corner with a confidence that belies its size. The platform, shared with the Dodge Charger and Dodge Magnum, was designed to offer spacious interiors and a luxurious ride, often featuring premium leather interiors, wood trim, and advanced technology for its time.
While the 2007 300 is a beloved vehicle, the 6.1L Hemi does have a reputation for specific issues that owners should be aware of. One common concern is the potential for carbon buildup on the intake valves and pistons, particularly if the vehicle has been driven in severe conditions or for mostly short trips. This buildup can restrict airflow and lead to rough idling or a loss of power. This is where high-quality synthetic oils and fuel additives play a crucial role in mitigating the effects of combustion byproducts.
Another potential problem for the 6.1L engine is the degradation of the spark plug threads in the aluminum cylinder heads. This can lead to stripped threads, requiring expensive repairs like helicoils or head replacements. Using high-quality oils with proper anti-wear additives helps reduce the stress on these components and can extend their service life. Additionally, the transmission fluid in the NAG1 automatic transmission can sometimes become sluggish or fail to shift smoothly as the vehicle ages or if the fluid becomes contaminated with metal particles. Regular fluid changes with a high-performance synthetic fluid are essential to maintain shift quality and prevent internal wear.
Finally, the cooling system on these high-output vehicles can be prone to overheating if the original equipment AMSOIL Propylene Glycol Antifreeze and Engine Coolant has not been changed frequently or if the radiator has accumulated debris. The unique OAT formulation in modern coolants helps prevent corrosion in the aluminum components of the engine and radiator, which is critical for preventing catastrophic overheating. By addressing these specific areas with the right lubricants, owners can enjoy the performance and reliability that the 2007 Chrysler 300 is famous for.