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Friction modifier

fordsbyjay
09-26-2007, 01:43 PM
I am changing my differential fluid in my F350 to Royal Purple synthetic and I was wondering if I still need to add the Ford Friction modifier? Anybody know?
Fordtek1
09-26-2007, 02:17 PM
no, the rp oil has modifiers already added
fordsbyjay
09-26-2007, 08:09 PM
Super thanks.