Ambi Pur's sponsorship, used to promote Ambi Pur car air fresheners, includes opening credits, break bumpers and closing credits around Fifth Gear.
The deal will also see the Ambi Pur logo placed on related promotional trailers shown on Five's TV channels.
The Ambi Pur broadcast sponsorship, negotiated by Five sponsorship and Manning Gottlieb OMD, will start at 8pm on 11 August at the start of the new series.
On the first show of the new series, World snooker champion Ronnie O'Sullivan will show off his driving skills, while the presenters will look at Ford's new SUV, Kuga, and race the Mitsubishi Evo X FQ300 against the Subaru Impreza WRX STi.