In 1991, Crompton drove a 6 cyl Holden VN Commodore S with Peter Brock and motoring journalist/race driver Peter McKay to win Class C and finish 4th outright in the inaugural Bathurst 12 Hour. Unfortunately his Formula Holden season never got off the ground and he missed the 1991 series, though he did lease Simon Kane's car and went on to finish 3rd in the Formula Holden support race at the 1991 Australian Grand Prix.