American Restaurants Group, which recently purchased the...

American Restaurants Group, which recently purchased the Del Taco and Naugles Mexican fast-food chains, named J. Walter Thompson as its new advertising agency. J. Walter Thompson’s Los Angeles office will oversee the combined $9-million advertising business. “Our ad agency will help us determine what we’ll call the chain and what it will look like,” said Dane Waitkus, director of marketing at Costa Mesa-based American Restaurants. The agency will begin creating ads for the firm later this summer.