DETROIT -- The U.S. Postal Service (USPS) has approved so-called “bio” lube oil for use in all of its local delivery vehicles in either the Los Angels or Denver districts. The rollout program is the first large-scale, regular use of the new engine oil made by AGRO Management Group of Colorado Springs. The USPS has been testing the oil — derived primarily from canola beans — in a number of in-use vehicles for several years. A spokesman for AGRO says it would like to see its first ...

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