Keeping your 2023 Subaru Ascent running smoothly requires more than just a standard oil change; it demands lubricants specifically engineered to handle the unique stresses of its 2.4-liter turbocharged engine. The FA24A powerplant operates under high thermal loads and demands precise viscosity to ensure optimal performance and longevity. Selecting the right AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil, matching filter, and compatible transmission fluid is essential for protecting your investment against wear, sludge, and the high RPMs often generated by this powerful boxer engine.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – Offers the highest level of protection with industry-leading film strength, reducing wear on critical turbocharger components and extending service intervals up to 25,000 miles.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Delivers extended drain protection up to 20,000 miles while providing superior cleaning power to prevent sludge buildup in the high-strung FA24A engine.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – A cost-effective, full-synthetic alternative that meets OEM specifications and effectively fights sludge and deposits for normal service intervals.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Formulated with enhanced detergents and anti-wear additives for vehicles exceeding 75,000 miles, helping to reduce oil consumption and restore engine performance.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns, ensuring contaminants are trapped while maintaining oil flow to keep engine components lubricated and cool.
- WIX Oil Filter – A premium aftermarket option featuring media that outperforms original equipment filters, offering reliable protection for the Ascent’s oil change routine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed ethylene glycol formulation designed to protect the cooling system metals and hoses, extending service life up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A non-toxic, concentrated antifreeze option that requires mixing with water, offering extended protection up to 150,000 miles or 5 years.
- AMSOIL 100% Synthetic CVT Fluid – Engineered to provide exceptional metal-to-metal frictional properties, ensuring smooth shifting and protection for the Ascent’s continuously variable transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers stable viscosity over a wide temperature range, improving ABS responsiveness and protecting braking systems from moisture contamination.
The heart of the 2023 Subaru Ascent is the FA24A engine, a 2.4-liter turbocharged flat-four that produces impressive power but requires precise lubrication. This engine is designed to run on 0W-20 viscosity oil, and synthetic options like Signature Series 0W-20 or Extended-Life 0W-20 are required for optimal protection. The oil capacity for a complete change, including the AMSOIL Oil Filter or WIX Oil Filter replacement, is 4.8 quarts. When performing maintenance, it is critical to torque the oil drain plug to 31 ft/lbs and install a new washer on the drain bolt to prevent leaks. Synthetic oil is mandatory for this engine; using conventional oil or failing to meet the specific weight requirements can void warranty protections and accelerate engine wear.
While the engine oil provides the foundation for vehicle health, the transmission and cooling systems require equally specialized attention. The Ascent utilizes a continuously variable transmission (CVT) that relies on specific fluid properties to manage the high heat generated by the turbocharged engine and the demands of towing or driving in hilly terrain. The total fill capacity for the transmission, including the cooler, is 12.7 quarts, though a standard fill with the cooler removed is approximately 12.5 quarts. For these systems, AMSOIL 100% Synthetic CVT Fluid is far superior to conventional options, as it resists thermal breakdown and maintains consistent friction characteristics over time.
Similarly, the cooling system must be protected against the extreme temperatures the FA24A engine can generate. The system holds 11.7 quarts of AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. Owners have the option to use a pre-mixed 50/50 formulation or a concentrated AMSOIL Propylene Glycol Antifreeze that allows for custom mixing ratios. Both options are designed to be phosphate-, nitrate-, and silicate-free to ensure compatibility with the vehicle’s metal components and rubber hoses. Using the correct coolant prevents corrosion, cavitation, and the formation of gunk that can clog narrow radiator passages.
AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is another often-overlooked component that plays a vital role in the safety of the Ascent. The recommended fluid meets FMVSS116 DOT-3 or DOT-4 specifications. Over time, standard brake fluids absorb moisture from the atmosphere, which lowers their boiling point and can lead to brake fade under heavy use. Switching to a 100% synthetic brake fluid ensures a stable viscosity regardless of the temperature, providing a firmer pedal feel and better response for the anti-lock braking system and traction control modules.
For owners who engage in towing, hauling heavy loads, or driving in severe conditions such as extreme cold or hot summers, the stress placed on the vehicle’s lubrication systems increases significantly. AMSOIL synthetic lubricants are designed to withstand these rigors better than conventional oils. They provide superior film strength, keeping moving parts separated even under high loads, and offer excellent cleaning properties to prevent the accumulation of carbon deposits and sludge that can clog oil passages in a turbocharged engine.
About the Vehicle
The 2023 Subaru Ascent stands as Subaru’s flagship three-row SUV, built on the Subaru Global Platform. This platform was designed from the ground up to offer a lower center of gravity, significantly increasing rigidity and safety while improving handling dynamics compared to previous generations. The Ascent is distinct in its segment for offering Subaru’s renowned Symmetrical All-Wheel Drive system, which provides balanced traction and confidence in various weather conditions, from slippery winter roads to rougher off-road trails.
Powered by the FA24DIT 2.4-liter turbocharged Boxer engine, the Ascent delivers a robust 260 horsepower and 277 lb-ft of torque. This powerplant replaces the earlier 2.4-liter naturally aspirated engine, providing a more responsive and efficient driving experience. The boxer layout, with its low center of gravity, enhances stability and cornering capability, making the vehicle feel more agile than its large size might suggest. For families who need space for seven or eight passengers without sacrificing the driving characteristics of a smaller car, the Ascent has found a dedicated following.
The interior is designed with practicality and comfort in mind, featuring spacious seating, ample cargo room, and advanced safety features like the EyeSight Driver Assist Technology. The vehicle is a favorite for those who need a capable daily driver that can also handle weekend adventures. Whether navigating city streets or embarking on cross-country road trips, the Ascent’s combination of safety, space, and all-weather capability makes it a practical and reliable choice for modern drivers.
Maintaining this versatile vehicle requires a commitment to high-quality fluids that match its engineering standards. By utilizing the recommended AMSOIL Signature Series oils, owners can ensure that their Subaru Ascent receives the protection it needs to perform at its peak. From the engine bay to the transmission and cooling systems, using the correct synthetic lubricants helps maximize efficiency, extend service intervals, and protect against the harsh realities of driving. This proactive approach to maintenance ensures that the vehicle remains a reliable partner for years to come.