Vin ID
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Joined: Feb 2009
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Vin ID
I just recently bought a 2007 F150 KR. I went to buy plugs tonight and they asked if my 5.4 used flex fuel. I had know idea and they told me to look at the vin and if the 8th letter was a V then it was. So I checked and it does so what all does this mean? And does it really matter with the plugs if it is flex or not?
Senior Member
Joined: Oct 2008
Posts: 3,121
Likes: 4
From: Burlington, VT
I just recently bought a 2007 F150 KR. I went to buy plugs tonight and they asked if my 5.4 used flex fuel. I had know idea and they told me to look at the vin and if the 8th letter was a V then it was. So I checked and it does so what all does this mean? And does it really matter with the plugs if it is flex or not?