5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Royal Purple Users???

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Old 03-21-2007, 12:12 AM
  #11  
aode08
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Default RE: Royal Purple Users???

ORIGINAL: Arno

For those running RP in their differentials, did you add friction modifier, or simply run straight RP? Rp claims it already has it added, true?
the only way youll notice hp gains, is if you actually use thier oil in everything, engine tranny and rear.

Yes you'll know the difference. The only issue is when it comes to the tranny, if you have an automatic, thats alot of dough for some tranny oil at? 16 quarts to flush
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Old 03-21-2007, 12:13 AM
  #12  
ZachW04Stang
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Default RE: Royal Purple Users???

I've never used royal purple but valvevoline claims the same thing. I always add a bottle of friction modifier just to be safe.
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Old 03-22-2007, 05:14 PM
  #13  
Arno
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Default RE: Royal Purple Users???

Well so far I have not added FM and all seems ok, time will tell I guess. Can there be too much FM in a differential?
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Old 03-22-2007, 06:38 PM
  #14  
88BlueGT
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Default RE: Royal Purple Users???

Not sure on if there can be too much of it or not. When I got my gears installed, I just went to the shop w/ the RP and that was it. When I picked up the car they said that they had to add it in there. I asked them why because the RP already had it and I forget what they said, but they used it anyway... and charged me almost $20 dollars for it![:@]Elite Autosports in Hamilton, NJ! BEWARE!
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Old 03-22-2007, 07:00 PM
  #15  
notch5oh
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Default RE: Royal Purple Users???

i didnt end up using it either so hopefully it wont blow up the rearend
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