The heart of your 2021 Hyundai Tucson is its 2.4-liter four-cylinder engine. To ensure optimal operation, the engine requires a specific oil grade and quantity. The manufacturer recommends SAE 5W-20 for all temperatures, although 5W-30 is also an acceptable alternative in certain conditions. However, SAE 5W-20 is the preferred viscosity for this specific engine design. When performing an oil change, including the filter, the total capacity is 5.1 quarts. After refilling, it is crucial to check the oil level to ensure it is within the proper range.
Using AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil is the superior choice for this vehicle. The synthetic formulation provides 75% more engine protection against horsepower loss and wear compared to conventional oils. It is guaranteed for up to 25,000 miles or one year, which is significantly longer than the intervals required by conventional oils. This extended interval capability means less maintenance time and better protection over time. For drivers who want a high-performance option that rivals factory specifications but exceeds them, the AMSOIL OE 5W-20 Motor Oil is an excellent alternative. It is trusted by professional engine builders and provides protection against Low-Speed Pre-Ignition (LSPI), a critical issue in modern turbocharged and high-strain engines.
The oil filter is just as critical as the oil itself. The AMSOIL Oil Filter (EA15K20) is engineered to allow lower restriction, which keeps engine parts better lubricated during start-up when wear is most prevalent. It offers greater capacity for small, wear-causing contaminants than competing filters, helping to extend engine life. For those who prefer a well-known aftermarket brand, the WIX Oil Filter 51334 is a robust option that provides premium media performance, improving upon the filtration capabilities of standard OEM filters.
Transmission and Cooling System Fluids
The transmission system in the 2021 Tucson also demands high-quality fluids to handle the rigors of towing, elevated temperatures, and challenging terrain. The automatic transmission (A6MF2-2) has a total fill capacity of 7.1 quarts for a 6-speed transmission. For this application, AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid (ATL) stands out. It is formulated to remain fluid in sub-zero temperatures while withstanding the intense heat of heavy use. This fluid provides reserve protection during abusive driving conditions and can help improve fuel economy.
If you are looking for a cost-effective yet high-performance alternative, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid (OTL) is a strong contender. It protects against wear and maintains fluidity in extreme cold, ensuring smooth shifting and extended service intervals. Switching to these synthetic transmission fluids can prevent costly transmission problems down the road, such as shudder, sludge buildup, and wear-related failures.
Cooling the engine is another vital aspect of maintenance. The 2021 Tucson requires 8.1 quarts of antifreeze and coolant. AMSOIL Passenger Car & Light Truck Antifreeze & Antifreeze & Coolant (ANTPC) is an ethylene glycol 50/50 pre-mix formulation that allows for use in a wide variety of vehicles. It features a unique poly-organic acid (OAT) formulation that exceeds original equipment manufacturer requirements. This coolant provides protection against corrosion for up to 150,000 miles or five years, whichever comes first. It is compatible with all other antifreeze colors and is free from phosphates, nitrates, and silicates, ensuring it won’t harm your cooling system’s metals, gaskets, or hoses. For those who prefer a concentrated formula, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant (ANT) offers similar long-life protection, requiring mixing with distilled water for optimal results.
Differential, Transfer Case, and Brake Fluid
For the drivetrain components, the transfer case and differential require specialized lubrication to ensure smooth power delivery and durability. The transfer case (U/K TRC) requires a GL-5 rated lubricant, with a capacity of 1.1 pints. Similarly, the rear differential (GL-5) requires a capacity of 1.3 pints. For both applications, AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube (SVL) is highly recommended. This gear lube provides advanced protection against wear and controls thermal runaway, which is essential for preventing failure in demanding conditions. It helps reduce operating temperatures and contains friction modifiers that are beneficial for limited-slip differentials.
The braking system should also be maintained with high-quality fluid. The 2021 Tucson specifies DOT 3 or DOT 4 brake fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid (BFLVCN) is designed to provide excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring consistent braking performance in both freezing winter conditions and hot summer driving. This synthetic fluid eliminates the boiling points associated with conventional fluids, providing a safer and more reliable braking system.
About the Vehicle
The 2021 Hyundai Tucson represents the third generation of Hyundai’s popular compact crossover SUV, a model line that has become a staple in the market for its blend of value and innovation. Born from Hyundai’s commitment to modern design and technology, the Tucson is built on a unibody platform that prioritizes interior space, ride comfort, and safety. It occupies a key position in the global market, competing directly with other top-selling crossovers like the Honda CR-V and Toyota RAV4.
The 2.4-liter four-cylinder engine, identified by engine code [L] L in the source data, is a naturally aspirated powertrain that delivers a balance of efficiency and adequate power for daily driving. This engine family is known for its reliability and smooth operation, making it a preferred choice for families and urban commuters who do not require turbocharged performance but still want a responsive driving character. The Tucson typically comes equipped with a six-speed automatic transmission that has been tuned for smooth shifting, contributing to the vehicle’s refined highway presence. Its interior design is characterized by a modern dashboard layout, high-quality materials for its class, and a user-friendly infotainment system, often featuring Apple CarPlay and Android Auto integration.
Owners of the 2021 Tucson often praise its practicality. The crossover features a spacious cargo area and rear seat that can be folded down to accommodate large items, making it versatile for both grocery runs and weekend adventures. Safety is another hallmark of the vehicle, with standard and available features including forward-collision avoidance, lane-keeping assist, and adaptive cruise control. This focus on safety technology makes it a top choice for parents and safety-conscious drivers.
While the 2021 Tucson is a robust vehicle, owners have identified a few common issues that can be mitigated with premium lubricants. One recurring concern involves the Variable Valve Timing (VVT) system, which can sometimes suffer from sticking or sluggish response due to sludge buildup. Using a high-quality synthetic motor oil like the AMSOIL Signature Series helps keep the VVT solenoids and cam phasers clean, ensuring they operate freely and maintain peak efficiency. Another potential issue is oil consumption, which can occur in engines with higher mileage. The unique chemistry of the AMSOIL High-Mileage 5W-20 Motor Oil is designed to restore engine seal integrity, helping to reduce oil burn-off in older engines. Some owners have also reported issues with the transmission shuddering during acceleration, a problem often exacerbated by fluid degradation. Switching to the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid can resolve these shudders by maintaining consistent friction characteristics and protecting the transmission’s internal components. Finally, the cooling system is critical in preventing overheating, especially during towing or stop-and-go traffic. Using a high-grade antifreeze like the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant ensures that the system remains corrosion-free and operates at optimal temperatures, preventing potential head gasket failures or warped components. Addressing these potential weaknesses with superior fluids can significantly extend the life of the 2021 Tucson and keep it performing like new for miles to come.