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WASHINGTON (AP) _ The government on Friday approved the $1.8 billion purchase by Shell Oil Co. of the Pennzoil Quaker State Co., the nation's largest motor oil maker and parent of the Jiffy Lube service stations.

The deal, announced this summer, is expected to be made final by the end of the year. It is the latest merger in a trend of oil industry consolidation in recent years.

The Federal Trade Commission conditioned its approval, however, on Pennzoil selling its interest in a company that makes the feed stock used in high-performance motor oil, saying the cost of such motor oil would otherwise probably increase because of the lack of competition.

The companies have agreed to the divestitures.