Discuss What Is The Correct Manual Transmission Fluid?? on AllFordMustangs.com, the place for Mustang enthusiasts.
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XT-M5-QS is correct. I don't know what's up with the Owners Guide, but the Ford specification, WSD-M2C200-C, is correct and corresponds to the Ford part number XT-M5-QS not XT-11-QDC. Motorcraft states that the Dual Clutch fluid to only be used in the DPS6, which is the automatically operated manual in the Fiesta. Motorcraft does not provide any technical information on the fluid, so it's hard to tell how applicable the fluid is to the GL-4 75W90/WSD-M2C200-C.
I noted the discrepancy in the manual as well. There are tech specs on the (what I believe) is correct fluid (XT-M5-QS). Burried in the Motorcraft website under chemicals I think. I also think the factory stuff is of very good quality. The Visc Index was high (good) and kinematic Visc #'s for 40C and 100C were fairly low (good), but I am still changing it so I know what I have and not what I am guessing. Also changing the Diff fluid out too for Lubro Moly LS 75W140. Hard as a muther scratcher to find though...still looking actually.