The agency was appointed without a pitch following the successful completion of a six-month project.
Smoking Gun will roll out a series of creative consumer and trade PR campaigns for Holt Lloyd brands, including Holts, Prestone, Redex and Simoniz.
The brief is to help create grassroots brand advocates within the car trade and encourage product trials with mechanics and consumers as well as supporting the launch of new product lines, focusing on the brand’s key audience of men over the age of 35.
Smoking Gun’s digital team will create a paid social advertising programme across Holt’s product range and provide data on the social conservation created by the brands.
Rick Guttridge, managing director at Smoking Gun, said: "At the end of last year we carried out a programme of work for its Holts and Prestone brands aimed specifically at creating professional brand advocates and celebrating the next generation of mechanics with a ‘Rising Stars’ campaign. This is at an exciting point in the company’s proud history as it becomes ever more progressive in its approach to digital marketing in order to cement its industry leading status."