Maintaining the 2008 Acura RL 3.5L is essential for ensuring long-term reliability and preserving the smooth driving dynamics that made this luxury sedan a favorite among enthusiasts. The vehicle is equipped with the robust J35A8 V6 engine, a powerplant known for its balance of performance and durability. However, like any sophisticated piece of engineering, it requires the correct lubricants to function at its peak. Using the wrong viscosity or inferior fluid can lead to premature wear, reduced fuel economy, and costly repairs. This guide details the specific lubrication recommendations for the 2008 Acura RL, covering engine oil, filters, transmission fluid, coolant, and brake fluids to help you perform proper maintenance.
Recommended AMSOIL Products
For the engine, the J35A8 requires a premium 5W-20 synthetic motor oil to ensure protection across a wide range of temperatures. AMSOIL offers several formulations designed to meet or exceed the manufacturer’s requirements while extending service intervals.
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – Provides unmatched engine protection against horsepower loss and wear, guaranteeing up to 25,000 miles or one year of performance.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – Delivers 37% more cleaning power to keep the engine running smoother, with a guaranteed protection interval of up to 20,000 miles.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – An excellent option that fights sludge and deposits, offering a balance of high-quality performance and value for standard service schedules.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, featuring enhanced anti-wear additives to reduce sludge and improve engine longevity.
- AMSOIL Oil Filter – Designed to filter 99% of contaminants at 20 microns, this filter allows for lower restriction and extends service life alongside synthetic oils.
- WIX Oil Filter – A premium aftermarket option offering improved media quality over original equipment manufacturer-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed formulation that protects cooling system metals, gaskets, and hoses for up to 150,000 miles or five years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, less toxic alternative that requires mixing with water, offering protection up to 150,000 miles in passenger cars.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and challenging terrain while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Guarantees smooth, shudder-free shifts and guards against leaks in automatic transmissions.
- AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube – Protects brass synchronizers and reduces rust, ideal for manual gear applications.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip differentials and controls thermal runaway.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Offers advanced protection against wear and rust, helping reduce operating temperatures in axles and transfer cases.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – Provides superior protection for high-load and extreme-pressure applications.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
The 2008 Acura RL features a 3.5-liter V6 engine that demands precise lubrication. With a capacity of 4.5 quarts when including a filter change, the engine oil must provide a balance of viscosity control and film strength. The J35A8 engine code indicates a naturally aspirated powerplant designed for smooth power delivery rather than high-strung racing. Selecting the correct oil viscosity, such as 5W-20, ensures the engine starts easily in cold weather while maintaining a protective oil film at operating temperature. The AMSOIL Synthetic Motor Oils listed above are tested to perform in both extreme heat and freezing cold, preventing the thinning and thickening issues that can plague conventional oils.
Beyond the engine, the transmission requires specific attention. The automatic transmission in the Acura RL holds a significant volume of fluid, with a total fill capacity of 7.6 quarts for the 5-speed transmission. Maintaining this fluid is critical for preventing shift shudder and extending the life of the gearbox. AMSOIL’s multi-vehicle automatic transmission fluids are engineered to resist oxidation and sludge buildup, ensuring the transmission shifts smoothly from a stop or during highway merging. For those with limited-slip differentials, the SEVERE GEAR products offer the necessary friction modifiers to prevent chatter while protecting gears from wear.
Cooling is another vital system for the Acura RL. The cooling system capacity is approximately 6.4 quarts. Over time, standard coolants can degrade, leading to corrosion in the radiator and engine block. Using a phosphate-free, silicate-free formulation like the AMSOIL Antifreeze & Coolant ensures compatibility with all metals and gaskets while providing superior protection against freezing and boiling. Additionally, the brake fluid in this luxury sedan must maintain a high boil point to ensure safety during hard stops. The AMSOIL DOT 3 and DOT 4 synthetic brake fluid offers a higher boil point than conventional fluids, preventing vapor lock and ensuring consistent pedal feel.
Vehicle Background
The 2008 Acura RL stands as a testament to Honda’s luxury division during the late 2000s. As the flagship sedan for the brand, the RL was positioned to compete directly with established German luxury sedans, offering a unique blend of Japanese engineering reliability and premium features. Under the hood, the 3.5-liter J-series V6 engine was a hallmark of this era, providing a linear and refined power output that appealed to drivers who valued smoothness over raw horsepower figures.
Known for its sophisticated “Real World” philosophy in design, the Acura RL of this generation featured a spacious interior with high-quality materials and advanced technology for its time, including a rear-seat entertainment system in higher trims. The vehicle sat on a platform that prioritized ride comfort and handling balance, often utilizing technologies like the Variable Cylinder Management (VCM) system in some model years to optimize fuel efficiency without sacrificing power. This made it a practical choice for daily commuting while retaining the capability for spirited driving on weekends.
The RL was built to last, sharing much of its mechanical DNA with other high-end Honda and Acura vehicles of the period. Its reputation for durability is well-earned, but it relies heavily on proactive maintenance to reach its full potential. Owners of this vehicle often praise its quiet cabin and predictable handling characteristics. By using the recommended AMSOIL lubricants, you align with the rigorous standards required to keep this luxury sedan running like new, ensuring that the suspension, steering, and powertrain continue to deliver the composed driving experience that defines the RL legacy.
While the engine is the heart of the vehicle, the entire drivetrain and fluid systems work in concert. Filters play a crucial role in this ecosystem. The WIX and AMSOIL oil filters ensure that contaminants are removed from the oil stream, preventing abrasive particles from causing wear on bearings and camshafts. Similarly, the air filter keeps dust and debris out of the intake, ensuring the engine breathes freely. For owners extending service intervals, the high-capacity filters and robust additive packages in AMSOIL oils allow for confidence in the protection provided over longer periods. Whether you are changing oil every 5,000 miles or extending to 12,000 or 25,000 miles, the correct fluid selection is the difference between a car that runs well and one that requires early repairs.
In conclusion, the 2008 Acura RL 3.5L is a sophisticated machine that rewards owners who invest in high-quality maintenance. By utilizing the specific AMSOIL products outlined in this guide, you ensure that the engine, transmission, cooling system, and brakes are protected with the best available synthetic lubricants. This approach not only extends the service life of the vehicle but also preserves its performance characteristics and resale value. From the initial oil change to the final brake fluid flush, the right fluids make all the difference in the longevity of your Acura RL.