Make sure they actually topped it off... I think my guys were too lazy to pull the intake tube and only topped off the active tank last time, I had to put almost 5 gallons in since my last service
They will be getting specific instructions when I take it in this week.
Rover - 2013 Holden Commodore SV6 Sedan
Clark - 2013 Holden Commodore Sport SV6 Wagon
Brumby - 1955 Holden FJ Ute