Ford Mustang Forum - View Single Post - just got a V6 2011 ford mustang and had a question
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post #12 of (permalink) Old 06-13-2010
DizoAZ
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Joined: Oct 2005
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I just got my 2011 a few weeks back, the manual says to run only 87 octane. I wouldn't run anything other than that.

Had a 99 Camaro V6 and used to run higher octane gas in it frequently. The dealership service department told me they highly discourage running anything higher than 87 in a V6 engine because the engine is not capable of the higher compression required to ignite the higher octane gasoline. They also told me that a carbon buildup occurs if you run higher octane gas in a V6.

This is just what I was told, I'm no expert, but I wouldn't run anything in the engine that the manual doesn't suggest. There's a reason why they say to run 87 octane and not 87+. The engine is designed to run the 87 rated octane gas.
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