SHELL OIL CO. plans to replace gasoline sold at its 8,700 U.S. retail outlets with three grades of a new unleaded version containing a detergent additive package said to reduce by as much as 90% the harmful deposits on engine intake valves. The new fuels combine two detergent additive systems. SHELL acquired 51 service stations and convenience stores in Florida from SuperAmerica Inc., a unit of Ashland Oil Inc. That increases to about 700 the number of Shell branded jobber and dealer retail

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