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post #16 of (permalink) Old 06-20-2014
SHELBY GT 350 Member
Sharad's Avatar
Joined: Nov 2010
Location: Fort Myers
Posts: 6,462
The claims are more MPGs and higher effective octane of the air/fuel mixture. This may be difficult to quantify, but what ISN'T difficult to quantify is that I can fill the 7oz UPR catch can on my 2011 5.0 in one oil change. (6,000 miles on full synthetic) and I'm glad that oil's not entering the intake manifold.

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