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Royal Purple Diff Fluid

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Old 3/12/12, 09:36 PM
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Royal Purple Diff Fluid

Anybody use RP diff fluid. It supposed to have the friction modifier already in it. Only found two threads mentioning it. Just wondering if there is chatter with just RP and no additional friction modifier. Or should I just use the Motorcraft stuff? Manual says 2.7 liters, does that include the friction modifier or is it 2.7 liters plus 4oz of friction modifier.
Old 3/12/12, 11:49 PM
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Originally Posted by devildog1679
Anybody use RP diff fluid. It supposed to have the friction modifier already in it. Only found two threads mentioning it. Just wondering if there is chatter with just RP and no additional friction modifier. Or should I just use the Motorcraft stuff? Manual says 2.7 liters, does that include the friction modifier or is it 2.7 liters plus 4oz of friction modifier.
I run it in my 06 GT and with RP you don't need any friction modifier as it's in RP
Old 3/13/12, 07:05 AM
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Originally Posted by Zaksgt

I run it in my 06 GT and with RP you don't need any friction modifier as it's in RP
So you got limited slip? If so no chatter?
Old 3/13/12, 07:11 AM
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I've run RP (with no FM) for acouple years now in the GT and ran it in my FX4 for 70k+ miles, no chatter in either.
Old 3/13/12, 11:16 AM
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Sounds like RP with no FM for now. I can always add some.
Old 4/5/12, 04:59 PM
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What about for use in a 2012 V6? I'm looking to change the trans and diff fluid in the next week.
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