Cars hit the track for Practice 1 at Sandown, with Jamie Whincup clocking the quickest time in the 30-minute session.
WATCH: THE GOAT DOMINATES! - PRACTICE 1 HIGHLIGHTS: PENRITE OIL SANDOWN SUPERSPRINT
Whincup pipped Cameron Waters by just 0.088s, with Tim Slade 0.175s down.
All told, the top 10 were split by 0.491s, with five Ford Mustangs in the top six.
Cars will return to the iconic Melbourne circuit for Practice 2 at 11:30am.
Check out the best shots from the first practice of the Penrite Oil Sandown SuperSprint.