2021 Nissan Frontier Fluid Specifications (API, Specs, Capacities)

The 2021 Nissan Frontier represents a unique transition year for the venerable midsize truck. While it still utilized the classic D40 body style, Nissan introduced the all-new powertrain—a 3.8-liter VQ38DD V6 paired with a 9-speed automatic transmission—ahead of the 2022 full redesign. This specific powertrain requires strict adherence to updated fluid specifications compared to the outgoing 4.0L V6 and 5-speed automatic combo.

As an ASE-certified master technician, I cannot stress enough how critical it is to use the exact Nissan factory-spec fluids on this model, particularly the new 9-speed transmission which is highly sensitive to fluid formulation. Below is the complete fluid specification sheet for the 2021 Nissan Frontier 3.8L V6.

Quick Reference

Fluid	Type/Spec	Capacity
Engine Oil	0W-20 API SP / ILSAC GF-6A	5.3 qt (5.0 L) with filter
Engine Coolant	Nissan Blue Long Life Antifreeze/Coolant (OAT)	12.1 qt (11.5 L)
Automatic Transmission	Genuine NISSAN Matic P ATF	10.6 qt (10.0 L) total dry fill
Transfer Case (4WD)	Genuine NISSAN Matic D ATF	2.1 qt (2.0 L)
Front Differential (4WD)	API GL-5 80W-90 Gear Oil	1.7 qt (1.6 L)
Rear Differential	API GL-5 75W-140 Synthetic Gear Oil	3.4 qt (M226) or 4.2 qt (C200)
Brake Fluid	Genuine NISSAN Super Heavy Duty DOT 3	Fill to MAX line
Power Steering	Genuine NISSAN PSF or Matic D ATF	Fill to MAX line
Washer Fluid	Standard windshield washer fluid	1.2 gal (4.5 L)

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Engine Oil Specifications

Spec: 0W-20 Full Synthetic (API SP / ILSAC GF-6A) Capacity: 5.3 quarts (with filter change)

The 3.8L direct-injected V6 is designed around 0W-20 weight oil to maximize fuel economy and ensure rapid valvetrain lubrication upon startup. You should look for the API SP and ILSAC GF-6A donut on the bottle, which guarantees protection against Low-Speed Pre-Ignition (LSPI) and timing chain wear.

• Interval: Nissan recommends changing the engine oil and filter every 5,000 miles or 6 months under severe duty (towing, stop-and-go, off-roading), or up to 7,500 miles under normal highway driving.
• Pro Tip: Direct-injected engines like the VQ38DD are prone to carbon buildup and fuel dilution. Stick strictly to the 5,000-mile interval to keep the piston rings clean and prevent excessive timing chain wear.

Engine Coolant

Spec: Genuine NISSAN Blue Long Life Antifreeze/Coolant (Phosphated OAT, NO Silicates) Capacity: 12.1 quarts

Nissan utilizes a proprietary Phosphated Organic Acid Technology (P-OAT) coolant that is dyed blue. This formula contains no silicates, borates, or amines, which is critical for protecting the aluminum water pump and heater core from cavitation and scale.

• Interval: The factory fill is rated for 10 years or 105,000 miles. Subsequent drain-and-fills should be performed every 5 years or 75,000 miles.
• Warning: Never mix Nissan Blue coolant with older green HOAT/IAT coolants or generic "universal" yellow/green coolants. Mixing chemistries can cause the additives to precipitate, creating a thick sludge that clogs the heater core and radiator passages.

Automatic Transmission Fluid (9-Speed)

Spec: Genuine NISSAN Matic P ATF Capacity: 10.6 quarts (dry fill) - drain and fill yields less.

The 2021 Frontier features the Jatco 9-speed automatic transmission. This gearbox requires Nissan Matic P fluid. Do not use Matic S, Matic D, or Matic J. Matic P is an ultra-low viscosity formulation designed specifically for the tight clutch pack tolerances and advanced torque converter lock-up strategies of the 9-speed.

• Interval: While often touted as "lifetime" fluid under normal conditions, severe duty (towing, hauling, off-road) dictates replacing the fluid every 30,000 miles.
• Warning: Never use a "universal" ATF in this 9-speed unit. The friction modifiers in aftermarket universal fluids can cause shift shudder and premature clutch failure. There is no dipstick; checking the fluid level requires a specific temperature-based overflow procedure using a scan tool.

Transfer Case Fluid (4WD Models)

Spec: Genuine NISSAN Matic D ATF Capacity: 2.1 quarts

Interestingly, while the transmission requires Matic P, the part-time 4WD transfer case strictly calls for the much older Matic D ATF specification.

• Interval: Inspect every 10,000 miles; replace every 30,000 miles if subjected to severe duty, towing, or frequent 4WD usage.

Front & Rear Differential Gear Oil

Front Spec: API GL-5 80W-90 Front Capacity: 1.7 quarts Rear Spec: API GL-5 75W-140 Synthetic Rear Capacity: 3.4 qt (Dana M226 axle) or 4.2 qt (C200 axle)

The heavy-duty rear axle requires a robust 75W-140 full synthetic GL-5 gear oil to handle the torque of the 3.8L V6. If your truck is equipped with the factory electronic locking rear differential (PRO-4X), it still utilizes standard GL-5 75W-140—no additional limited-slip friction modifier (LSD additive) is required because it uses a mechanical locking mechanism rather than clutch packs.

• Interval: Inspect every 10,000 miles. Change every 20,000 to 30,000 miles if you tow frequently, drive in deep water, or off-road extensively.
• Pro Tip: Always loosen the fill plug before removing the drain plug. You don't want to drain the axle only to discover the fill plug is seized.

Brake Fluid

Spec: Genuine NISSAN Super Heavy Duty Brake Fluid or equivalent DOT 3 Capacity: Fill to MAX line

Nissan still specifies DOT 3 brake fluid for the 2021 Frontier. You can safely use DOT 4 due to its higher boiling point, as it is completely miscible with DOT 3, but never use silicone-based DOT 5.

• Interval: Brake fluid is hygroscopic (absorbs moisture from the air). Flush the brake fluid every 2 years or 20,000 miles to prevent internal corrosion of the ABS hydraulic control unit and brake calipers.

Power Steering Fluid

Spec: Genuine NISSAN PSF or equivalent (Matic D ATF is generally acceptable) Capacity: Fill to MAX line

The 2021 Frontier retained traditional hydraulic rack-and-pinion power steering rather than moving to an electric power steering (EPS) rack. Use Nissan PSF or a high-quality equivalent.

• Interval: Flush the power steering fluid every 50,000 miles to extend the life of the steering pump and rack seals.

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Keeping your fluids clean and using the exact OEM specifications is the single best way to ensure your Nissan Frontier goes the distance. Don't risk expensive drivetrain damage to save a few dollars on universal fluids.

Need help changing these fluids or servicing your transmission? Find a trusted shop on Repairius.