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Old 03-13-2014, 05:48 PM   #1
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2004 ford mustang v6 differential oil

I need to change the differential oil on my 2004 Ford Mustang V6, I've been recommended 75w140 and 80w90 Royal Purple, so I don't know what to use

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Old 03-13-2014, 07:28 PM   #2
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Check your owners manual. It should tell you. Then just take the differential cover off, wipe it out, and put the new oil in until a small, slow stream trickles out the top. Hope this helps.

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Old 03-13-2014, 07:55 PM   #3
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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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