Which Country developed the DEF Fuel for Diesel Engines.. And just what is it's purpose? In the North Country it's seems to be more of a Hindurance than Good.. Somewhat like Ethanol Fuel..?

Its actual Diesel Exhaust fluid. Not fuel. Its supposed to bind the particulates in diesel exhaust as part of the Environazi emissions crap so they can smoke more pot without dying of cancer.

It was developed to reduce Nitrous Oxide levels, in diesel engines designed with special catalytic converters.

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Originally Posted by TxGreaseMonkey

It was developed to reduce Nitrous Oxide levels, in diesel engines designed with special catalytic converters.

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Which Country developed it?

I think it was Germany, but you need to verify that.