The 2021 Subaru Crosstrek 2.5L engine, identified by the FB25D 1 engine code, is designed to deliver efficient power and reliable performance for drivers who demand versatility from their crossover. While Subaru’s factory specifications recommend 0W-20 synthetic oil, the demands of modern driving conditions often require more robust protection. Proper lubrication is critical for maintaining engine longevity, ensuring fuel economy, and preventing premature wear on sensitive components like the turbocharger and timing chain. Using the correct oil grade, a high-quality oil filter, and compatible fluids for the transmission and cooling system is the best way to protect your investment and keep the Crosstrek running smoothly for years to come.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – Provides unsurpassed engine protection with the highest level of performance, offering up to 25,000 miles of guaranteed protection.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Delivers up to 20,000 miles of protection with enhanced cleaning power to keep the engine running smoother.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – A cost-effective option that outperforms conventional oils and meets strict OEM specifications.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles to reduce sludge and oil consumption.
- AMSOIL Oil Filter – Offers 99% filtering efficiency at 20 microns with high dirt-holding capacity to maximize engine life.
- WIX Oil Filter – A premium alternative featuring media that improves over original equipment manufacturer-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed, phosphate-free formulation that protects cooling system metals for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula requiring mixing with water, offering superior corrosion protection.
- AMSOIL 100% Synthetic CVT Fluid – Provides exceptional metal-to-metal frictional properties tailored for Subaru’s Continuously Variable Transmissions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures stable viscosity over a wide temperature range for excellent ABS responsiveness.
Selecting the right motor oil is the first step in a comprehensive maintenance regimen for your Crosstrek. The 2.5L FB25D 1 engine requires 4.4 quarts of 0W-20 oil, including the filter. It is important to note that synthetic oil is required for this engine to function correctly. When changing the oil, ensure the drain plug is torqued to 31 ft/lbs and a new washer is installed on the drain bolt to prevent leaks. After refilling, always check the oil level to ensure accuracy.
The AMSOIL Signature Series is the top-tier choice for those who demand the absolute best protection. It offers 75% more engine protection against horsepower loss and wear compared to industry standards. This oil is designed to handle the most severe driving conditions, from extreme temperatures to extended drain intervals, allowing you to go up to 25,000 miles or one year between changes. For drivers who want slightly shorter intervals but still want premium performance, the Extended-Life series provides 37% more cleaning power, helping to keep the engine running smoother and longer with up to 20,000 miles of protection.
For owners looking for a value-oriented synthetic option, the AMSOIL OE 0W-20 Motor Oil fights sludge and deposits with a 100% synthetic formulation. It has been proven to protect turbochargers and meets rigorous OEM specifications, making it an excellent choice for maintaining the vehicle’s factory performance characteristics. If your Crosstrek has surpassed the 75,000-mile mark, the AMSOIL High-Mileage Motor Oil is the ideal solution. It features unique chemistry including boosted detergents and dispersants to reduce sludge by 67% and enhance anti-wear additives to help older engines perform better.
Filter selection is equally critical. The AMSOIL Oil Filter (EA15K13-EA) is engineered for extended service life, allowing lower restriction to keep engine parts properly lubricated. It provides greater capacity for contaminants than competing filters, which helps reduce engine wear. Alternatively, the WIX Oil Filter (57055-EA) offers premium media that improves upon OEM filters, providing reliable protection for your Crosstrek’s engine.
Transmission and Cooling System Fluids
The automatic transmission (TR580) in the 2021 Crosstrek is a sensitive component that requires specific fluid to operate smoothly. The total fill capacity is 12.2 quarts. Using a standard transmission fluid can lead to shuddering or premature wear. The AMSOIL 100% Synthetic CVT Fluid provides exceptional metal-to-metal frictional properties, ensuring smooth operation even under the most severe driving conditions. This fluid protects your transmission from wear, sludge, and temperature-related problems, giving you confidence on the road.
The cooling system of the 2.5L engine requires 8.8 quarts of fluid. Maintaining the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is essential for preventing overheating and corrosion. It is a unique poly-organic acid (OAT) formulation that is compatible with all other antifreeze and coolant colors. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, protecting all cooling system metals, gaskets, and hoses for up to 150,000 miles or five years. For those who prefer a concentrated formula, the AMSOIL Propylene Glycol Antifreeze offers similar protection and requires mixing with distilled or high-quality water.
Safety and Brake Performance
Safety is paramount for any vehicle, and the braking system is no exception. The 2021 Subaru Crosstrek utilizes a brake system that benefits from high-performance fluid. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is designed to provide excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring consistent braking performance whether you are stopping quickly in an emergency or driving in extreme heat or cold.
For vehicles that may be sitting for extended periods, seasonal storage products can be beneficial. The AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. The AMSOIL Engine Fogging Oil is a highly effective rust preventive designed to protect internal engine components during long periods of inactivity.
About the Vehicle
The 2021 Subaru Crosstrek represents the second generation of Subaru’s popular subcompact crossover, a vehicle that has become a staple for drivers who need a capable, fuel-efficient machine without sacrificing utility. Built on the Subaru Global Platform, this model offers a lower center of gravity compared to its predecessors, resulting in sharper handling and increased stiffness. The 2.5-liter FB25D 1 engine serves as the powertrain option for this specific guide, delivering 182 horsepower and 176 lb-ft of torque. This naturally aspirated four-cylinder engine, mated to a Lineartronic continuously variable transmission (CVT), provides a smooth driving experience characterized by linear acceleration and excellent fuel economy.
Subaru’s signature All-Wheel Drive (AWD) system, known for its symmetry and reliability, is a core feature of the Crosstrek. This system actively monitors road conditions and can distribute power front and rear as needed, making the vehicle a favorite for owners who live in areas with snow, rain, or uneven terrain. The chassis tuning allows for a balance between on-road comfort and off-road capability, with sufficient ground clearance to handle light trails and rougher roads. The interior space is surprisingly generous for its class, offering ample cargo room for outdoor gear, which is a common use case for Crosstrek owners who enjoy camping, hiking, or skiing.
Owners of the 2021 Crosstrek generally appreciate the vehicle’s practicality and reliability. It is often praised for its user-friendly interface and the inclusion of Subaru’s EyeSight Driver Assist Technology, which includes adaptive cruise control, lane departure warning, and automatic pre-collision braking. The vehicle’s reputation for durability is well-earned, with many lasting well over 100,000 miles with proper maintenance. However, like any modern vehicle, there are specific maintenance challenges that can arise.
One common issue found in vehicles equipped with the FB series engines, including the FB25D 1, is the tendency for oil consumption. Over time, some engines may burn oil, leading to low oil levels between changes. Using high-quality synthetic motor oils with enhanced oil consumption control additives can help mitigate this issue, ensuring the engine stays lubricated and preventing the potential for sludge buildup that can exacerbate the problem. Another concern for owners who frequently drive in heavy traffic or engage in spirited driving is the heat buildup in the CVT. The fluid in the transmission can degrade over time, leading to shuddering or slipping. Switching to a high-performance synthetic CVT fluid can help maintain optimal frictional properties and protect the internal components from heat and wear.
Carbon buildup in the direct injection system is another potential issue for engines of this era. The high pressures and direct injection methods used to maximize efficiency and power can sometimes lead to carbon deposits on intake valves, which can affect performance and fuel economy. Using a fuel additive like the AMSOIL P.i. Performance Improver can help restore injector flow and clean the system, ensuring the engine breathes freely and performs as intended. Finally, the cooling system is a critical area for maintenance; if the coolant degrades or leaks, it can lead to overheating, which can be catastrophic for the engine. Regular flushing and replacement with a high-quality, long-life antifreeze ensures the cooling system remains efficient and free from corrosion, protecting the aluminum components of the engine block and radiator.