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As with the twin categories birthed by Pc-11 (CK-4 and FA-four), Pc-12 will a produce a “C” subcategory [as in CK-four) that will preserve its backwards compatibility. A new “F” subcategory that replaces FA-four will not need to have to retain backwards compatibility — engineer-speak for an oil formulation that is approved for use in all existing vehicles. The U.S. Power Data Administration predicts a recovery in fuel prices could come in the fall. Based on $120/barrel oil costs and a standard price active tag relationship of gas and diesel, Ibendahl said highway diesel rates ought to be close to...