 Kọ itẹsiwaju fun paragirafi yii - Ni opin ọdun 1991, Brock ati Perkins pinnu lati lọ ọna wọn lọtọ pẹlu oluṣakoso Brock, Steve Frazer, ti o ṣe agbekalẹ Advantage Racing ti o da ni North Melbourne. Gẹgẹbi apakan ti adehun naa, awọn ọkọ oju-omi ọkọ oju-omi meji ti 1991 Perkins Engineering kọ VN Commodores ni a ra nipasẹ Advantage. Perkins yoo nigbamii sọ ni ọdun 2014 pe adehun rẹ pẹlu Brock ati Mobil sọ pe ko gba laaye lati lu ẹlẹgbẹ rẹ ni awọn ere-ije ayafi ti ko ba ṣee ṣe fun apẹẹrẹ ọkọ ayọkẹlẹ Brock ni iṣoro kan, botilẹjẹpe Perkins ṣẹgun Brock ni awọn ere-ije mejeeji ti akoko 1991 ti o pari awọn ere-ije atilẹyin ni 1991 Australian Grand Prix : ìpàdé kan ní ìlú adelaide. 