The deal, which includes sponsorship credits, accreditation online and on all related on-air promotional trailers, was negotiated by Rachael Wheeler, sponsorship manager at Five, and Andy Corcoran, who is sponsorship director at ZenithOptimedia.
In addition, the on-air sponsorship is backed by branding on five.tv/fifthgear.
Wheeler said: "Fifth Gear is one of Five's flagship programmes and as such it was important to work with a brand that matches the quality of the show".
The show is presented by Vicki Butler-Henderson, Tiff Needell, Tom Ford and, new addition to the team, Holly Samos.
The current series features guest spots from Girls Aloud, who are given a masterclass in driving supercars on a racing circuit.
Other guests during the series will include Jodie Kidd and DJ Tim Westwood, as well as Maggott from Goldie Lookin' Chain.
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