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6 Liter Engine No Longer Flex Fuel?

pm26

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pm26 Senior Enthusiast

pm26

Posted
Posted

I just looked at a 2011 Sierra 2500 with a 6.0 liter V8 and the engine does not appear to be flex fuel type anymore. I believe that the flex fuel 6 liter was standard on 2009 and maybe 2010 models? It the flex fuel engine at least optional now?

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted
No Flex Fuel in the 6.0s in the 2500/3500s 07 and up.

The 1500 6.0s yes.................

 

Na,Not even in the 1500's was the 6.0 flex-fuel,I know mine isn't,although I wish it was.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

I don't think the Hybrid's are flex-fuel,If it is it will have a Yellow gas cap and "Flex-Fuel" emblem on the tailgate.

nickvrebel Senior Enthusiast

nickvrebel

Posted
Posted

yep, look for the yellow gas cap as a dead giveaway

 

my 2009 Sierra SLT with a 5.3L is not a flex fuel motor.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted
Here's one for ya.....My manual says my truck is flex fuel, but I have the normal black gas cap. Never used E85 as I have never seen it. 06 5.3L alum block. ???

 

The manual mentions flex-fuel because the 5.3 VIN code "Z" (RPO code L59) is E85 capable ....However VIN code "T" (RPO code LM7) and the alum.block 5.3 VIN code "B" (RPO code L33) is not.

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