Maintaining the 2018 Chrysler 300 equipped with the robust 5.7L HEMI V8 (Engine Code EZH) requires more than just standard maintenance; it demands precision lubrication to handle high performance and longevity. The V8 engine produces significant power and heat, placing immense stress on critical components. Using the correct viscosity and high-quality synthetic lubricants ensures that the engine, oil filter, transmission, and drivetrain operate smoothly under all conditions, from scorching summer drives to cold winter starts. Choosing the right oil and fluid products can extend service intervals while providing superior protection against wear, sludge, and thermal breakdown.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The ultimate protection for your HEMI engine, offering 75% more protection against horsepower loss and wear than the industry standard. This oil is rated for up to 25,000 miles or one year under normal service.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – A cost-effective alternative that provides 20,000 miles of guaranteed protection with 37% more cleaning power to keep the engine running smoothly and reduce LSPI events.
- AMSOIL Oil Filter EA15K50 – Designed to work perfectly with the Signature Series or Extended-Life oil, this filter captures 99% of contaminants down to 20 microns, reducing engine wear and extending service life.
When servicing the 5.7L engine, the oil capacity is 7.0 quarts when including the filter change. It is crucial to adhere to this volume and torque the drain plug to 20 ft-lbs to prevent leaks or damage. For owners with engines exceeding 75,000 miles, the AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil is an excellent choice, featuring a boosted detergent package to reduce sludge by 67% and enhanced anti-wear additives. Alternatively, the AMSOIL OE 5W-20 100% Synthetic Motor Oil provides a reliable, OE-scheduled solution that effectively fights sludge and deposits.
Beyond the engine, the 2018 Chrysler 300’s 8-speed automatic transmission (8HP70) requires specific care. The total fill capacity for this transmission is 9 quarts. Using a high-performance AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is essential to withstand the rigors of towing, elevated temperatures, and challenging terrain. For a value-oriented option that still protects against wear and resists sludge, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is a strong contender.
Cooling system health is paramount for the 5.7L HEMI, which can operate at high temperatures. The capacity varies based on the specific heater core configuration, ranging from 14.7 to 15.1 quarts with the HDC. 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 for up to 150,000 miles or 5 years. For those who prefer a concentrated coolant, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers protection up to 150,000 miles or 5 years and surpasses standards for metallic corrosion.
The rear differential on the 230 RIA model requires 2.3 pints of lubricant. To ensure smooth operation and protection against rust, corrosion, and thermal runaway, the AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube is the ideal choice. If the vehicle features a limited-slip differential, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube includes friction modifiers designed specifically for limited-slip applications.
Brake system safety is critical for a vehicle of this size and power. The recommended fluid is a DOT 3 hydraulic brake fluid meeting MS-4574 specifications. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range. To further enhance fuel economy and protect the GDI fuel system, consider the AMSOIL P.i.® Performance Improver Gasoline Additive, which restores injectors to 100% flow rate after a single tank of fuel.
Why Proper Lubrication Matters for the Chrysler 300
The 2018 Chrysler 300 is a full-size sedan known for its powerful American muscle heritage combined with a luxurious ride. Under the hood, the 5.7L HEMI V8 is a dominant force, capable of delivering substantial horsepower and torque. However, this performance comes with thermal and mechanical stress. Without high-quality lubricants, components can suffer from premature wear, sludge buildup, and fluid breakdown. Synthetic lubricants like those from AMSOIL are engineered to withstand extreme temperatures and harsh driving conditions better than conventional oils, ensuring that the engine, transmission, and drivetrain operate at peak efficiency.
Regular maintenance using the correct fluid capacities and types is the best way to protect your investment. The 7-quart capacity for the 5.7L engine is a specific requirement that must be met to ensure proper lubrication of the crankshaft, camshafts, and other internal components. Similarly, the oil filter is a critical component in maintaining this efficiency. The transmission fluid capacity of 9 quarts for the 8HP70 automatic transmission is vital for proper hydraulic pressure and shift quality. Neglecting these fluids can lead to costly repairs, reduced fuel economy, and a decline in the vehicle’s overall performance.
About the Vehicle: A Legacy of American Luxury
The 2018 Chrysler 300 represents the final year of the LX platform, a model that has long been celebrated for blending the power of a muscle car with the comfort of a luxury sedan. Introduced in 2004, the 300 quickly gained a reputation for its bold design, powerful V8 engines, and spacious interior. By 2018, the vehicle had evolved into a sophisticated cruiser, offering owners a blend of performance and refinement that is rare in the full-size sedan segment.
At the heart of this sedan is the available 5.7L HEMI V8 engine, a beloved powerplant in the American automotive industry. This engine is renowned for its “hemispherical” combustion chambers, which promote efficient airflow and powerful performance. The 2018 model typically produces around 360 horsepower, providing effortless acceleration and a commanding presence on the road. The rear-wheel-drive layout, combined with the optional 8-speed automatic transmission, delivers a smooth and responsive driving experience. Whether used for daily commuting or long-distance road trips, the Chrysler 300 offers a comfortable and confident ride.
Despite its reliability, the 2018 Chrysler 300 can experience certain issues that are common to vehicles with this age and engine type. One prevalent concern is sludge buildup in the 5.7L HEMI engine, particularly if the vehicle is used for frequent short trips where the oil does not reach optimal operating temperatures. Using a high-quality synthetic motor oil with a strong detergent package can significantly mitigate this issue and keep the engine clean. Another common problem involves transmission shuddering or harsh shifts, which can be addressed by using a premium synthetic transmission fluid that maintains stability under load and heat. Additionally, owners may encounter coolant leaks or corrosion in the cooling system over time, especially in older vehicles, making a high-performance antifreeze essential for longevity. Finally, brake fade or reduced responsiveness can occur due to moisture absorption in standard brake fluid; switching to a synthetic brake fluid with a higher boiling point can restore pedal firmness and improve safety.
By choosing AMSOIL synthetic lubricants, owners can proactively address these potential issues, extending the life of their vehicle and maintaining its performance characteristics. The combination of superior oil filtration, thermal stability, and wear protection ensures that the 2018 Chrysler 300 continues to deliver the powerful and luxurious driving experience it was designed for, mile after mile.