The 2021 Chrysler 300 equipped with the 3.6-liter Pentastar V6 is a full-size sedan that demands specific lubrication to maintain its smooth driving character and performance. Using the correct viscosity and high-quality synthetic fluids is essential for protecting the engine, transmission, and drivetrain components from wear, especially given the vehicle’s torque requirements and potential for high-mileage use. AMSOIL synthetic lubricants provide the necessary protection to keep the engine clean, reduce friction, and extend service intervals, ensuring the vehicle performs reliably in all conditions.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The premier choice for maximum engine protection, offering up to 25,000 miles of service in normal service conditions.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – A robust option designed for extended drain intervals, providing up to 20,000 miles of guaranteed protection.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – An excellent value that outperforms conventional oils while fighting sludge and deposits with a 100% synthetic formulation.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce sludge and boost detergent power.
- AMSOIL Oil Filter – Provides 99% filtering efficiency at 20 microns to keep engine parts lubricated and reduce wear.
- WIX Oil Filter – A premium aftermarket option offering improved media over original equipment manufacturer-branded filters.
Proper lubrication begins with selecting the right motor oil viscosity and quality. For the 2021 Chrysler 300 with the 3.6L V6 engine, the manufacturer recommends a 5W-20 viscosity for all temperatures. The oil capacity for the engine is 5.9 quarts when the filter is replaced. This engine benefits significantly from synthetic oils, which flow better at startup and maintain stability under high heat. Whether you drive in extreme winter cold or hot summer traffic, AMSOIL synthetic motor oils ensure the engine receives consistent protection against horsepower loss and wear.
Engine Oil and Filtration
Choosing the right oil is critical for the longevity of the Pentastar engine. The AMSOIL Signature Series 5W-20 is engineered to deliver 75% more engine protection against horsepower loss and wear compared to industry standards. It is the top-tier choice for drivers who want the absolute best, whether they are pushing the limits with performance driving or simply want to maximize the vehicle’s lifespan. For those looking for a balance of performance and value, the AMSOIL Extended-Life 5W-20 offers robust protection for up to 20,000 miles. It includes advanced cleaning power to help keep the engine running smoother for longer.
If you are on a stricter budget but still require synthetic benefits, the AMSOIL OE 5W-20 is a highly effective option. It fights sludge and deposits effectively, making it a reliable replacement for factory-fill oils. Additionally, for Chrysler 300 models that have surpassed the 75,000-mile mark, the AMSOIL High-Mileage 5W-20 is recommended. This specific formulation contains boosted detergents and enhanced anti-wear additives designed to reduce sludge by 67% and clean engines, helping them perform better as they age.
The AMSOIL Oil Filter (EA15K19-EA) is designed to work in harmony with AMSOIL synthetic motor oils. It offers 99% filtering efficiency at 20 microns, capturing wear-causing contaminants that can damage engine internals. The filter’s design allows for lower restriction, keeping critical engine parts lubricated, and it has a greater capacity for small contaminants than many competing filters. For those preferring a well-known aftermarket brand, the WIX Oil Filter (WL10010-EA) is also a recommended alternative, offering premium media that improves upon OEM filtration standards.
Transmission and Differential Fluids
The 2021 Chrysler 300 relies on an 8-speed automatic transmission (model 850RE) that requires specific fluid to handle the torque of the V6 engine. The total fill capacity for this transmission is 9.7 quarts. Maintaining this fluid is crucial for smooth shifts and preventing costly wear. AMSOIL offers a range of transmission fluids designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero temperatures.
For the ultimate in performance and fuel efficiency, the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice. It provides reserve protection during heavy use and helps protect the transmission from the stresses of daily driving. Alternatively, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers a cost-effective solution that protects against wear while promoting smooth, shudder-free shifts. The AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid also resists harmful sludge and guards against leaks, ensuring the transmission operates smoothly in cold weather conditions.
Moving to the drivetrain, the vehicle utilizes various rear axle assemblies that require high-quality gear lubricants. For the Front 175 FIA differential, the capacity is 1.3 pints, and it requires a 75W-90 synthetic gear oil. The AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube provides advanced protection against wear and thermal runaway. It contains friction modifiers specifically for limited-slip applications and helps reduce operating temperatures to extend the life of oil, seals, and equipment. For rear axle applications, such as the Rear 195 or Rear 230, the capacity ranges from 1.5 to 2.3 pints. In these cases, the AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube is the specified fluid, offering rust protection and controlled thermal runaway to keep the rear axle running smoothly.
Coolant, Brake Fluid, and Other Fluids
Cooling system integrity is vital for the 3.6L engine, which has a total cooling system capacity of 10 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that protects all cooling system metals, gaskets, and hoses. It is engineered to exceed original equipment manufacturer requirements and offers protection for up to 150,000 miles or 5 years. For those who prefer a concentrated solution, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is available, which can be mixed with distilled water to achieve the desired concentration.
Brake fluid quality is essential for safe stopping power. The vehicle requires MOPAR DOT 3 Brake Fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is the recommended replacement. It offers excellent ABS and traction-control responsiveness and provides a stable viscosity over a wide temperature range, ensuring consistent braking performance in any weather.
About the Vehicle
The 2021 Chrysler 300 represents the continued evolution of one of the last remaining traditional full-size sedans in the American market. Built on a platform derived from the LX architecture, which also served the Dodge Charger and Challenger, the 300 is celebrated for its imposing road presence, rear-wheel-drive configuration, and spacious, luxurious interior. It occupies a unique niche, blending the comfort and handling of a European sedan with the bold styling and V6 or V8 powertrains characteristic of American automotive culture.
The 3.6-liter Pentastar V6 engine, a staple of the Chrysler group for nearly two decades, is a reliable and powerful powerplant that delivers ample horsepower for daily commuting and highway passing. While it is not a performance muscle car, it offers a smooth and refined driving experience. The interior typically features high-quality materials, offering a premium feel that rivals more expensive luxury brands. The vehicle’s reputation is built on its ability to provide a comfortable ride, excellent cargo space in the trunk, and a sophisticated design that has remained consistent over several years of production.
Owners of the 2021 Chrysler 300 often appreciate its versatility as a family hauler or a long-distance cruiser. However, like any vehicle with a high-mileage potential, regular maintenance is key to preserving its value and performance. Common issues that can affect older 300s include minor oil consumption due to piston ring wear over time, potential cooling system degradation leading to overheating if coolant is neglected, and transmission shuddering or harsh shifting due to fluid degradation. These problems are often exacerbated by the use of conventional fluids that break down under stress.
Using AMSOIL synthetic oils and fluids can effectively address these common problems. The high-temperature stability of AMSOIL motor oil helps reduce oil consumption by maintaining film strength at the piston rings, even as they wear. The extended service life of the antifreeze prevents the corrosion and scale buildup that can clog the radiator or cause overheating, a common concern for this engine. Furthermore, the superior shear stability of AMSOIL transmission fluids can prevent the shudder and harshness that plagues the 8-speed automatic as it ages, ensuring smooth shifts throughout the vehicle’s life. By adhering to a rigorous maintenance schedule with premium synthetics, owners can keep their Chrysler 300 performing like new for years to come.