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I need to change my differential oil and I can't find anywhere what type of oil to use. Chilton book doesn't say and neither does the manual. 1993 F350 7.3 IDI, RWD, C5 axle code, 4.10 ratio. Anybody know?
I imagine its the standard 80w90. Now the important question is if C5 is open or limited slip because if it's limited slip you'll need to add in that additive.
10-19-2016, 02:58 PM
