The partnership will see Saatchi & Saatchi provide creative services across the entire Z platform, including brand, retail, digital, POS, content, social and CRM.
In May the company, which also operates the Caltex brand, delivered a net profit after tax of $57 million for the 12 months to March 31, an increase of 165 per cent on the previous year.
Revenue fell 29 per cent to $3.52 billion, reflecting the continuing pressure of reduced demand and a squeeze on refinery margins.
The appointment comes at a critical point for Z Energy, given the large-scale effort to reduce the carbon footprint of New Zealand's vehicle fleet.
The Government earlier this year launched a range of measures the would reward consumers who buy cleaner vehicles.
The challenge for Saatchi & Saatchi will be to present the Z Energy narrative as progressing rather toward lower carbon emissions rather than remaining stagnant.
Saatchi & Saatchi NZ chief executive Mark Cochrane told the Herald that the company is keen to set itself apart and show New Zealanders how it plans to evolve.
Z Energy also outlined ambitious plans in August to grow in-store retail revenue by 20 per cent to $500m by 2025.
This is to make up for the decline in tobacco sales, which currently make up more than 40 per cent of total non-fuel revenue.
Saatchi & Saatchi will no doubt play a key role in driving that growth by encouraging consumers to spend more in stores.
Saatchi & Saatchi is owned by the Publicis Groupe holding company, which has had a good week with the announcement that it had also picked up the Westpac media account.
That account will be managed by Spark Foundry, a new agency that Publicis has launched in the local market.