Owner’s Guide pages for Super Duty models also showMotorcraft SAE 75W-90 Synthetic Rear Axle Lubricant, XY-75W90-QLS / WSS-M2C918-A for theF-350 (Dana M80) rear axle. Oil Viscosity: SAE 75W-90. 2004–2014 Ford F-350 (Dana M80 rear axle) —XY-75W90-QLS specified; limited-slip axles require friction modifier (XL-3) per notes.
