TBWA/Chiat/Day, in Playa del Rey, Calif.,
The review began in January with 14 agencies vying for the account. Search consultant Roth Associates, New York, handled the review.
GSD&M, which had the account since 1996, retains Pennzoil's approximately $20 million media planning and buying account.
Houston-based Shell Lubricants is a division of the Shell Oil Co., an affiliate of Royal Dutch/Shell Group of Cos. Shell Oil acquired Pennzoil-Quaker State last March for $1.8 billion.
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Alice Z. Cuneo contributed to this report.