2015 Ford F-350 Super Duty: Complete Fluid Specifications

Quick Reference: 2015 Ford F-350 Fluid Specs

Fluid	Type/Spec	Capacity
Engine Oil (6.2L Gas)	Motorcraft SAE 5W-20 Synthetic Blend / WSS-M2C945-A	7.0 qts (6.6L)
Engine Oil (6.7L Diesel)	Motorcraft SAE 10W-30 Diesel / WSS-M2C171-F1	13.0 qts (12.3L)
Engine Coolant	Motorcraft Orange Antifreeze / VC-3-B / WSS-M97B44-D	20.8-29.2 qts (19.7-27.6L)
Transmission Fluid	Motorcraft MERCON LV / XT-10-QLVC	16.7 qts (15.8L)
Transfer Case Fluid	Motorcraft XL-12	1.9 qts (1.8L)
Front Differential (Dana 60)	SAE 80W-90 Premium Rear Axle Lubricant / XY-80W90-QL	2.0 qts (1.9L)
Rear Differential (Ford 10.5")	SAE 75W-140 Synthetic Rear Axle Lubricant / XY-75W140-QL	3.5 qts (3.3L)
Rear Differential (Dana M275)	SAE 75W-140 Synthetic Rear Axle Lubricant / XY-75W140-QL	4.2 qts (4.0L)
Brake Fluid	Motorcraft High Performance DOT 4 LV / PM-20	Fill to max line
Power Steering Fluid	Motorcraft MERCON V / XT-5-QMC	Fill to max line
Washer Fluid	Motorcraft Premium Windshield Washer Concentrate / ZC-32-A	Fill to max line
Diesel Exhaust Fluid (DEF)	API Certified ISO 22241	5.0 gal (18.9L)

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Engine Oil

For the 2015 F-350, the correct engine oil depends on which powerhouse is under the hood. Using the wrong oil can lead to reduced fuel economy, premature engine wear, and potentially catastrophic failure.

• 6.2L V8 Gas: This engine calls for Motorcraft SAE 5W-20 Synthetic Blend Motor Oil, meeting Ford specification WSS-M2C945-A. This spec ensures the oil has the proper viscosity and additives to protect the engine's variable camshaft timing (VCT) system. While full synthetic is an acceptable upgrade, be sure it meets the Ford spec. The capacity is 7.0 quarts (6.6 liters) with a filter change. Never use a heavier weight oil like 10W-30 or 15W-40 in the gas engine, as it can impede oil flow on startup and cause damage to the complex VCT phasers.

• 6.7L Power Stroke V8 Diesel: The turbo-diesel requires a robust oil designed for the rigors of high-compression, high-heat operation. The factory specifies Motorcraft SAE 10W-30 Diesel Motor Oil meeting Ford’s WSS-M2C171-F1 spec. This oil is also referred to as API Service CK-4. In climates where temperatures consistently fall below 0°F (-18°C), SAE 5W-40 synthetic diesel oil is also acceptable. The crankcase holds a substantial 13.0 quarts (12.3 liters). Always use a diesel-rated oil; using gasoline engine oil will result in rapid breakdown and severe engine damage.

Engine Coolant

Ford specifies Motorcraft Orange Antifreeze/Coolant, which is a Phosphate-based Organic Acid Technology (P-OAT) coolant. The corresponding Ford specification is WSS-M97B44-D, and the premixed part number is VC-3-B. This coolant is designed for long-life performance and compatibility with the aluminum, iron, and plastic components in the cooling system.

Crucially, never mix this coolant with other colors or types. Mixing orange P-OAT with green conventional coolant or even the older Ford gold Hybrid OAT (HOAT) can cause it to gel, clogging the radiator, heater core, and oil coolers. This will lead to severe overheating and expensive repairs. System capacity varies by engine and options but generally falls between 20.8 and 29.2 quarts (19.7 to 27.6 liters). When topping off, always use a 50/50 mix of distilled water and Motorcraft Orange coolant.

Transmission Fluid

The 6-speed TorqShift SelectShift automatic transmission in the 2015 F-350 requires Motorcraft MERCON LV automatic transmission fluid (ATF). This is a low-viscosity, high-performance fluid engineered specifically for modern Ford transmissions. The Ford specification number is XT-10-QLVC.

Do not use any other type of ATF, such as MERCON V, Dexron VI, or any "universal" ATFs. These fluids have different frictional properties and viscosity characteristics that are incompatible with the TorqShift’s clutches and solenoids, which can cause harsh shifting, slipping, and eventual transmission failure. A full fluid exchange requires approximately 16.7 quarts (15.8 liters).

Transfer Case & Differentials

Properly servicing the 4WD system and axles is key to durability when towing or hauling.

• Transfer Case: The electronic shift-on-the-fly (ESOF) transfer case uses Motorcraft Transfer Case Fluid, part number XL-12. It’s a specialty fluid and other ATFs or gear oils should not be used. Capacity is 1.9 quarts (1.8 liters).

• Front Differential: The Dana 60 front axle requires SAE 80W-90 Premium Rear Axle Lubricant, Ford part number XY-80W90-QL. Capacity is 2.0 quarts (1.9 liters).

• Rear Differential: Most F-350s use a Ford 10.5-inch or Dana M275 rear axle that demands SAE 75W-140 Synthetic Rear Axle Lubricant (part no. XY-75W140-QL). This full-synthetic fluid provides maximum protection under heavy loads. If the truck is equipped with a limited-slip differential (LSD), you must add 4 ounces (118 ml) of Motorcraft Additive Friction Modifier (part no. XL-3) to prevent clutch chatter and binding. Capacity is between 3.5 and 4.2 quarts (3.3-4.0L) depending on the specific axle.

Brake & Power Steering Fluid

• Brake Fluid: The hydraulic brake system requires Motorcraft High Performance DOT 4 LV Motor Vehicle Brake Fluid, part number PM-20. This is a low-viscosity fluid designed to work with modern ABS and traction control systems. DOT 3 is technically compatible but not recommended. Never use DOT 5 silicone fluid. The system should be kept full to the "MAX" line on the reservoir.

• Power Steering Fluid: Unlike many vehicles that use generic power steering fluid or ATF, Ford specifies Motorcraft MERCON V, part number XT-5-QMC. Using the wrong fluid can lead to a noisy pump and damage steering components.

Washer Fluid & DEF

• Windshield Washer Fluid: Use any high-quality washer fluid, but Ford recommends Motorcraft Premium Windshield Washer Concentrate with Bitterant, part number ZC-32-A, mixed with distilled water.

• Diesel Exhaust Fluid (DEF): For the 6.7L Power Stroke, API-certified Diesel Exhaust Fluid meeting ISO 22241 is mandatory. This fluid is critical for the selective catalyst reduction (SCR) system to reduce NOx emissions. The DEF tank holds 5.0 gallons (18.9 liters) and should be refilled whenever the instrument cluster indicates a low level.

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