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Old 06-26-2015, 12:11 AM   #29
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Originally Posted by mjwcubed View Post
new to diesel and new to MB/AI - what is pure diesel? and how will I know? thanks!
Pure diesel will not have the 5% or 20% biodiesel labels on the pumps.

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Old 06-27-2015, 07:02 AM   #30
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NO bio-diesel in the fuel. The pumps are required to display a sticker on the pump or show a sign adjacent to the pump if the fuel is blended just like with what used to be known as gasoline.

If you find pure gasoline and fill the vehicle, you will see a noticeable increase in fuel economy and performance. The alcohol additive raises the per gallon price and reduces the btu capacity per gallon and thus we pay more for less mileage per gallon.

Many engines and their gaskets are intolerant of bio- diesel. Smaller vehicles lack the space for the huge fuel filters found on the big rigs. Thus smaller filters could plug after a few tanks of 20% bio-diesel.

Folks that drive small diesels, especially foreign brands with a smaller dealer network, should carry a couple of spare fuel filters and know how to change it if it plugs in a remote location.

My 2012 Cummins explicitly states in it's owner manual a maximum of 5% bio- diesel. Mercedes service explicitly told me to never put bio-diesel in either the 2007 or 2009 V6 Diesel engines. They also stated bio-diesel could plug the catalytic like part of the exhaust.

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Old 06-27-2015, 08:10 AM   #31
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I have seen a 10-20% label at a FJ. The Shell and BP stations i frequent don't have that but they are combination pumps with gas on one side and diesel oon the other. They have an ethanol sticker for the gas but nothing on the diesel side. I hope that means they are pure diesel.


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Old 06-27-2015, 08:31 AM   #32
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Originally Posted by Protagonist View Post
Nothing has a positive energy balance. That would be a violation of a basic law of thermodynamics, the law of entropy. You will never get as much energy out as the energy that went into making it.
I mean more energy out than went into extraction/production of the fuel.

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