The 1975 Australian Manufacturers' Championship was a CAMS sanctioned national motor racing title for vehicles manufacturers.[1] The championship was contested over a five round series.[2]
Each round was a single race of 250 km distance or greater, open to Group C Touring Cars. Cars competed in four classes based on engine capacity:
For all rounds other than the Bathurst round, championship points were awarded on a 9-8-7-6-5-4-3-2-1 basis for the first nine places in each class. For the Bathurst round, championship points were awarded on an 18-16-14-12-10-8-6-4-2 basis for the first nine places in each class. Additional points were awarded at all rounds on a 4-3-2-1 basis for the first four outright places. Only the highest placed vehicle from each manufacturer was eligible to score points at any given round.[1]
| Position [3] | Manufacturer | Car | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Total |
| 1 | Holden | Holden LH Torana SLR5000 L34 | 13 | 13 | 22 | 11 | 13 | 72 |
| 2 | Ford | Ford XB Falcon GT & Ford Escort Mk 1 RS2000 | 11 | 9 | 16 | 13 | 11 | 60 |
| 3 | Mazda | Mazda RX-3 | 9 | 9 | 18 | 9 | 8 | 53 |
| 4 | Leyland | Morris Cooper S | 9 | 9 | 18 | 9 | 6 | 51 |
| 5 | Alfa Romeo | Alfa Romeo 2000 GTV | 9 | 3 | 18 | 9 | 8 | 47 |
| 6 | Datsun | Datsun 240K, Datsun 260Z 2+2 & Datsun 1200 | 5 | 6 | 16 | - | 9 | 35 |
| 7 | Honda | Honda Civic | 7 | 8 | 4 | 3 | 8 | 30 |
| 8 | Toyota | Toyota Corolla | 3 | - | - | 5 | - | 8 |
| Mercedes-Benz | Mercedes-Benz 280E | - | 3 | - | - | 5 | 8 | |
| BMW | BMW 2002Ti | - | - | - | 8 | - | 8 |
Note: Only models which contributed to a manufacturer’s points total are shown in the above table.