1984 saw an extension of the track to to comply with FIA regulations for minimum track length for World Championship events. It also saw the first 500 km race held at the circuit, the Castrol 500, being Round 3 of the 1984 Australian Endurance Championship. Along with the circuit changes, some AUD$600,000 had been spent relocating the pits from its original place between what was turns one and two (now turns one and four) to its now permanent place coming onto the main straight. Peter Brock and Larry Perkins took their Holden Dealer Team VK Commodore to a one lap victory in the 1984 Castrol 500; it was to be the last of Brock's record nine wins in the Sandown enduro events.