Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Royal Purple

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Old Oct 8, 2007 | 08:02 AM
  #11  
rasicc's Avatar
rasicc
 
Joined: Sep 2007
Posts: 6
From:
Default RE: Royal Purple

Just saw a Horsepower episode where they measured HP & torque w/conventional oil and RP. RP showed gains of12 hp & 6 ft lbs torque. May want to take that w/a grain of salt though because I'm sure RP is one of their sponsors.

Clint
66 Mustang Coupe (in teardown)
Old Oct 8, 2007 | 10:28 AM
  #12  
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68EFIvert
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Joined: Jan 2007
Posts: 682
From: Washington
Default RE: Royal Purple

I saw that episode as well. I don't know why you would doubt the numbers. The dyno doesn't know who the sponsor is. I do think they chose RP over some other synthetic because of the sponsorship though. I will put synthetic in my new engine after it has a chance for the rings to seat, about 500 miles.
Old Oct 8, 2007 | 11:13 AM
  #13  
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jrrhd73must
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Joined: May 2005
Posts: 540
From: Georgia
Default RE: Royal Purple

ORIGINAL: Mr. Classic EFI

In my opinion, not really. There are a lot of variables.
If you have a new fresh engine built to tight tollerances(modern CNC type machining, on production engines has this) and you plan to maximize the extended 8-10k mile fluid change programs, Synthetics are great.
On an engine built 25 years ago, & your fluid change schedual is 3k miles, why throw away money??
Some folks choose to do so, as is their right. I would feel wasteful,doing thatmyself.
There are a lot of variables, I agree completely. However, with the money invested in these classics, and the proven firction reduction and wear reduction - I think it is money well spent. Also, I have noticed that my 73 runs cooler with the synthetc - reduced friction - reduced heat. I use extended drain intervals on my classic also.
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