In 1965 Auger formed the group The Steampacket, along with Long John Baldry, Julie Driscoll, Vic Briggs and Rod Stewart. With Driscoll and the band, Trinity, he went on to record several hit singles, notably a cover version of David Ackles' "Road to Cairo" and Bob Dylan's "This Wheel's on Fire", which was featured on Dylan Covered. In 1969 Auger, Driscoll and Trinity appeared performing in the United States on the nationally telecast 33⅓ Revolutions Per Monkee.
In 1970 he formed Brian Auger's Oblivion Express, shortly after abandoning the abortive "Wassenaar Arrangement" jazz-fusion commune in a small suburb of The Hague. The Oblivion Express served to cultivate several musicians, including future The Average White Band drummers Robbie McIntosh and Steve Ferrone, as well as guitarist Jim Mullen. Likewise, in 1971 he produced and appeared on Mogul Thrash's only album, Mogul Thrash. Two members of that band, Roger Ball and Malcolm Duncan, would also go on to form the Average White Band.