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Old 01-11-2013, 07:58 PM
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It gets worse.
Even farm equipment (combines) have DPF's on them and have to use DEF.

I had a guy coming into the store and was buying DEF in 10-case lots every other day during harvest. The amount of fuel that a combine burns is horrific!

Apparently the major component to this stuff is urea, which is also found in fertilizer.

More info here:
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