Maintaining the 2009 Acura RL with its powerful 3.7-liter V6 engine requires precise attention to fluid specifications and quality lubricants. The engine code J37A2 is designed for smooth, high-revving performance, but that performance depends entirely on the health of its internal components. Using the correct viscosity and synthetic formulation ensures that critical parts remain protected against wear, heat, and deposits, whether the vehicle is used for daily commuting or spirited weekend driving. Neglecting the proper fluid change intervals or using inferior fluids can lead to premature wear on the turbocharger components, sludge buildup, and reduced fuel efficiency.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – Offers unsurpassed engine protection for up to 25,000 miles, providing 75% more protection against horsepower loss and wear than competing oils.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – Features 37% more cleaning power to keep the engine running smoother and longer with guaranteed protection for up to 20,000 miles.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – Fights sludge and deposits with a 100% synthetic formulation, outperforming conventional oils and protecting turbochargers effectively.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Formulated specifically for vehicles with over 75,000 miles, this oil contains boosted detergents to clean engines and reduce sludge by 67%.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns, allowing lower restriction to keep engine parts lubricated and offering greater capacity for contaminants.
- WIX Oil Filter – A premium alternative option with media that offers improvements over original equipment manufacturer-branded filters for reliable protection.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that greatly surpasses corrosion standards, allowing for flexible mixing to suit specific cooling system needs.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures, remaining fluid even in sub-zero conditions to ensure smooth shifting.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth, shudder-free shifts while resisting harmful sludge and guards against leaks for extended service intervals.
- AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube – Protects brass synchronizers and inhibits rust, offering excellent seal compatibility and long service life for manual transmissions.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip applications and helps reduce operating temperatures to extend oil and seal life.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Delivers advanced protection against wear and thermal runaway, suitable for high-stress differential and transfer case applications.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – A heavier grade option for extreme load conditions, providing long oil and equipment life with superior thermal stability.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS and traction-control responsiveness with a stable viscosity range that resists boiling under heavy braking.
The importance of selecting the right oil grade for your 2009 Acura RL cannot be overstated. The engine was designed to operate with a specific viscosity to ensure optimal clearance and film strength. The manufacturer specifications align with a 5W-20 viscosity rating for all temperature conditions. When adding oil, it is important to note the capacity constraints. The engine requires 4.2 quarts when performing a dry fill or refill after a complete flush, and 4.5 quarts when including a filter change. Regardless of the quantity added, it is essential to check the oil level after the refill to ensure it falls within the safe operating range on the dipstick. The torque specification for the oil drain plug is 29 ft/lbs, which helps prevent stripped threads during maintenance.
For drivers who want the absolute maximum protection for their vehicle, the AMSOIL Signature Series 5W-20 is the top choice. This product delivers 75% more engine protection against horsepower loss and wear compared to top-tier conventional oils. It is specifically engineered to extend the time between oil changes, offering a guarantee of up to 25,000 miles or one year, whichever comes first. For those who prefer a slightly more economical option that still outperforms conventional oils, the OE (Original Equipment) 5W-20 provides an excellent balance of cost and performance, effectively fighting sludge and deposits. If your vehicle has accumulated significant mileage, the High-Mileage 5W-20 formulation includes boosted detergent and dispersant packages to help clean the engine and enhance anti-wear additives.
Transmission and Differential Care
The automatic transmission in the 2009 Acura RL is a critical component that benefits greatly from high-quality synthetic fluids. The total fill capacity for the automatic transmission is 8.1 quarts, while an initial fill requires approximately 3 quarts. Maintaining the correct fluid level and quality is vital to prevent shuddering, slipping, and premature wear. The AMSOIL Signature Series Multi-Vehicle Automatic Transmission Fluid is designed to withstand heavy towing and elevated temperatures, ensuring the transmission remains fluid even in sub-zero conditions. For a more budget-friendly option that still offers robust protection, the OE Multi-Vehicle Automatic Transmission Fluid resists sludge and promotes smooth, shudder-free shifts.
The transfer case also requires specific attention, particularly in all-wheel-drive configurations. Depending on the specific configuration, the transfer case may require GL-4 or GL-5 rated gear lubricants. For applications requiring a manual transmission or transaxle lube, the AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube offers outstanding cold-flow properties and protects brass synchronizers. For limited-slip applications or higher stress levels, the SEVERE GEAR line provides superior protection against wear and thermal runaway. The SEVERE GEAR 80W-90, 75W-90, and 75W-110 grades all contain friction modifiers and help reduce operating temperatures, significantly extending the life of oils, seals, and equipment.
Cooling System and Brake Fluid Maintenance
A healthy cooling system is essential to keep the high-output J37A2 engine from overheating. The coolant capacity for the 2009 Acura RL is 6.4 quarts. Using a compatible coolant is crucial to prevent corrosion and ensure efficient heat transfer. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free formulation that protects all cooling system metals, gaskets, and hoses. For those who prefer a concentrated product that allows for custom mixing ratios, the AMSOIL Propylene Glycol Antifreeze offers protection up to 150,000 miles or 5 years.
Safety on the road is paramount, and brake performance relies heavily on the quality of the brake fluid. The recommended fluid for this vehicle is a DOT 3 specification, such as the AMSOIL Heavy Duty Brake Fluid. 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 consistent pedal feel and prevents boiling during intense braking scenarios, keeping your stopping power reliable in all conditions.
About the Vehicle
The 2009 Acura RL stands as a testament to Acura’s commitment to blending luxury with high-performance engineering. Powered by the robust 3.7-liter V6 engine, the RL delivers a level of power and smoothness that was highly regarded in the luxury sedan segment of the late 2000s. This vehicle is based on the Honda Global platform, a design known for its structural rigidity and balanced handling characteristics. The RL was positioned as a flagship model for the brand, offering features that rivaled European competitors in terms of interior appointments and technological integration.
Owners of the 2009 Acura RL often appreciate its sophisticated driving dynamics. The 3.7-liter engine provides ample power for overtaking and highway merging, while the suspension tuning offers a comfortable ride without sacrificing handling precision. The vehicle’s interior is typically praised for its quiet cabin, high-quality materials, and driver-centric layout. Whether driven as a daily commuter or used for weekend getaways, the RL remains a capable and reliable choice for those seeking a refined driving experience. Regular maintenance with premium fluids ensures that this sophisticated machine continues to deliver the smooth, quiet, and powerful performance it was designed for.
Maintaining the 2009 Acura RL is a straightforward process when you have the right products on hand. From the initial oil change to the final brake fluid flush, AMSOIL provides a comprehensive solution for every lubrication need. By adhering to the recommended service intervals and using these high-performance fluids, vehicle owners can extend the life of their car and ensure it continues to run smoothly for years to come. Whether you choose the Signature Series for maximum protection or the OE line for reliable performance, you are making a choice that prioritizes the longevity and health of your Acura.