| Race | Date | Driver | Team | Car | Engine | Tyre | Grid | Race | F.lap rank | |||
| 1 | CAN | 22/09/1968 | Jo Siffert | R.R.C. Walker Racing Team | Lotus 49B | Ford Cosworth DFV (3.0L V8) | F | 3 | Ret | 1 | ||
| 2 | MEX | 03/11/1968 | Jo Siffert | R.R.C. Walker Racing Team | Lotus 49B | Ford Cosworth DFV (3.0L V8) | F | 1 | 6 | 1 |