please help me know the answer ..I know it has something to do with EPA regulations.In the united States, Legislation reduced the allowable sulfur contest in diesel fuel to____ %?15 ppm for ULSD - ultra low sulfur diesel.
http://www.exxon-mobil.no/USA-English/GF鈥?/a>
http://www.epa.gov/OMS/regs/fuels/diesel鈥?/a>
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