2024 Ford F-350 Super Duty — Fluid Type Specs

As an ASE-certified master technician, I know that keeping a heavy-duty workhorse like the 2024 Ford F-350 Super Duty on the road requires strict adherence to factory maintenance schedules. Whether you are running the 6.8L gas, the 7.3L Godzilla V8, or the massive 6.7L Power Stroke diesel (Standard or High Output), using the exact OEM-specified fluids is not just a recommendation—it is a requirement to protect your powertrain warranty and ensure maximum longevity.

Below is your comprehensive guide to the exact fluids, capacities, and specifications for the 2024 Ford F-350 Super Duty, directly referencing Ford Motorcraft specifications.

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil (6.8L & 7.3L Gas)	5W-30 Synthetic Blend (WSS-M2C961-A1, API SP)	7.5 qt (7.1 L) with filter
Engine Oil (6.7L & 6.7L HO Diesel)	10W-30 or 5W-40 Synthetic (WSS-M2C171-F1, API CK-4)	15.0 qt (14.2 L) with filter
Engine Coolant	Motorcraft Yellow Prediluted (WSS-M97B57-A2)	Gas: ~21-23 qt / Diesel: ~33-35 qt total
Transmission Fluid	MERCON ULV (WSS-M2C949-A)	~16-18 qt (dry fill)
Transfer Case (4WD)	MERCON LV (WSS-M2C938-A)	1.9 qt (1.8 L)
Front Differential	SAE 80W-90 Premium (WSP-M2C197-A)	~2.9 qt (2.8 L)
Rear Differential	SAE 75W-140 or 75W-85 Synthetic (WSL-M2C192-A)	3.3 – 4.5 qt (varies by axle)
Brake Fluid	Motorcraft DOT 4 LV (WSS-M6C65-A2)	Fill to MAX line
Power Steering Fluid	MERCON LV (WSS-M2C938-A)	Fill to MAX line (~1.5 qt)
Diesel Exhaust Fluid (DEF)	Motorcraft DEF (API Certified, ISO 22241)	~7.4 gallons (28.0 L)
Windshield Washer Fluid	Premium Windshield Wash (WSK-M8B16-A)	Fill to reservoir neck

Note: Capacities are approximate. Always verify fluid levels via dipstick, fill plug, or reservoir lines, and consult your owner's manual for specific generation-dependent axle capacities.

Engine Oil

Ford's engine oil requirements vary drastically depending on the powerplant under the hood of your F-350.

Gas Engines (6.8L V8 and 7.3L V8): Ford requires SAE 5W-30 Motorcraft Synthetic Blend or Full Synthetic meeting specification WSS-M2C961-A1 and API SP. The capacity is 7.5 quarts with a filter change. Pitfall: Do not use thicker oils like 10W-40 or 15W-40 in the gas engines. The variable valve timing (VVT) phasers rely on precise oil viscosity to function correctly.

Diesel Engines (6.7L Power Stroke and 6.7L HO): For normal operation, Ford recommends SAE 10W-30 Super Duty Diesel Motor Oil. However, for severe duty, biodiesel use (up to B20), or heavy towing, Ford strongly recommends upgrading to SAE 5W-40 Full Synthetic meeting specification WSS-M2C171-F1 (API CK-4). Note: The 6.7L takes a massive 15 quarts. Never use an oil that does not carry the WSS-M2C171-F1 approval, as the high-pressure fuel pump and valvetrain demand exceptional anti-wear additives not found in standard oils.

Engine Coolant

The 2024 F-350 exclusively uses Motorcraft Yellow Antifreeze/Coolant (spec WSS-M97B57-A1 for concentrated, -A2 for prediluted). This is a Phosphated Organic Acid Technology (P-OAT) coolant. Pitfall: Do not mix this with older Motorcraft Orange (OAT) or Motorcraft Gold (HOAT). Mixing coolant types can cause chemical reactions that sludge up the heater core and degrade water pump seals. The diesel engine has two separate cooling systems (primary for the engine, secondary for the charge air cooler/transmission), so be sure to check and fill both reservoirs.

Transmission Fluid

All 2024 F-350 models utilize Ford’s heavy-duty 10-speed automatic transmissions (the 10R100 or 10R140 TorqShift). These units specifically require MERCON ULV (Ultra-Low Viscosity) fluid, spec WSS-M2C949-A. Pitfall: Never use universal ATF, MERCON V, or MERCON LV in a 10-speed transmission. The ULV fluid is exceptionally thin to reduce parasitic drag and improve efficiency. Using an older, thicker fluid will result in harsh shifting, overheating, and eventual clutch pack failure.

Transfer Case and Differentials

Transfer Case: Four-wheel-drive models require MERCON LV Automatic Transmission Fluid (WSS-M2C938-A) in the transfer case. Note the difference here: the transmission takes ULV, but the transfer case takes LV. Do not mix them up.

Differentials: The front Dana axle typically utilizes SAE 80W-90 Premium Rear Axle Lubricant. For the rear, the fluid depends on which axle your truck was built with (Sterling 10.5, Dana M275, or M300). Most heavy-duty towing applications call for a 75W-140 Full Synthetic (spec WSL-M2C192-A). Note: If your truck is equipped with a mechanical limited-slip differential (LSD), you must add 4 to 8 ounces of Motorcraft Friction Modifier (EST-M2C118-A) to prevent clutch chatter during tight turns. Electronic locking differentials do not require this additive. Verify your specific rear axle and capacity in the OEM service info or owner's manual.

Brake Fluid and Power Steering

Brake Fluid: The Super Duty requires Motorcraft DOT 4 LV High Performance Motor Vehicle Brake Fluid (spec WSS-M6C65-A2). The "LV" stands for Low Viscosity, which allows the ABS and electronic stability control hydraulic control units to pulse the brakes rapidly in cold weather. Never use DOT 3 or silicone-based DOT 5 fluid.

Power Steering: Unlike many modern half-ton trucks that use electric power steering, the F-350 Super Duty still utilizes a heavy-duty hydraulic power steering setup. This system runs on MERCON LV ATF (spec WSS-M2C938-A). Do not pour standard "power steering fluid" from a generic auto parts store bottle into this system.

Diesel Exhaust Fluid (DEF) and Washer Fluid

DEF (Diesel Models Only): The 6.7L Power Stroke engines require Diesel Exhaust Fluid meeting the ISO 22241 standard to operate the Selective Catalytic Reduction (SCR) system. The tank holds roughly 7.4 gallons. Always ensure you are pouring DEF into the blue-capped reservoir and not the diesel fuel tank. Using old, crystallized, or contaminated DEF will trigger a "Speed Limited to 50 MPH" countdown warning.

Washer Fluid: Any standard windshield washer fluid is acceptable, though Motorcraft Premium Windshield Wash (WSK-M8B16-A) is factory fill. Use a winter-blend fluid rated for -20°F or lower if you live in a cold climate to prevent reservoir and line cracking.

Maintaining a 2024 Ford F-350 Super Duty to factory standards requires precision and the right fluids. If you need assistance flushing these fluids, inspecting your driveline, or completing factory scheduled maintenance, leave it to the professionals.

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