Your Mustang's rear axle could have 75W-140 or 80W-90 viscosity gear lube. It's important to use the correct viscosity to avoid wear damage. The guide says the differential for the Cobra R Mustang has a Ford recommended viscosity of 75W-140 and the other two differentials, controlled slip and standard, Ford recommends 80W-90. If your car takes the 80W-90, the hot ticket in a synthetic gear lube is the 75W-90 viscosity and will provide better protection for your rear end. Motorcraft is the OEM standard.
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