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Letters by ProQuest


While our operating costs have increased with the 2007 engines mandated by the U.S. Environmental Protection Agency, this cost increase is not unique to Caterpillar engines; the same holds true for all manufacturers when compared with pre-2007 engines. To comply with EPA emissions standards, EPA ?7 engines require diesel particulate filters, ultra-low-sulfur diesel fuel and low-ash engine oil, and therefore cost more to operate.

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Frank Nicholson
Light & Medium Truck; Jun 2010; 23, 5; Docstoc
pg. 12

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