Despite his retirement from full-time racing, Dumbrell returned in a limited basis from 2012 onwards as a co-driver for the two-driver endurance races in V8 Supercars, the Sandown 500, Bathurst 1000 and since 2013, the Gold Coast 600.
Dumbrell returned in a limited basis from 2012 onwards as a co-driver for the two-driver endurance races in V8 Supercars, the Sandown 500, Bathurst 1000 and since 2013, the Gold Coast 600. This was despite his retirement from full-time racing.