The 1948 South Australian 100 was a motor race staged at the Lobethal Circuit in South Australia on 1 January 1948.[1] It was contested as a handicap race with the slowest cars starting first and the fastest cars last.[2] The race was staged over 12 laps,[1] a total distance of 105 miles.[3] It was open to cars of any engine size.[4]
The race, which was the second South Australian 100 to be held at Lobethal, was won by Jim Gullan driving a Ballot Oldsmobile.[5]
| Position | Driver | No. | Car | Handicap | Time[6] | Laps | |
| 1 | Jim Gullan | 16 | Ballot Oldsmobile | 11:35 | 81m 5s | 12 | |
| 2 | Granton Harrison | 11 | 10:10 | 79m 49s | 12 | ||
| 3 | Ron Edgerton | 32 | MG TC Special | 16:00 | 86m 19s | 12 | |
| 4 | R. Hamilton | 30 | 16:00 | 12 | |||
| 5 | A. Eadie | 34 | 16:00 | 12 | |||
| 6 | Norman Andrews | 4 | Stewand Austin | 7:00 | 12 | ||
| 7 | Jim Skinner | 24 | Ballot Ford V8 | 13:50 | 12 | ||
| 8 | Harold Clisby[7] | 29 | MG TC | 16:00 | 12 | ||
| 9 | Rick Howard | 37 | Austin 7 Ulster | 20:00 | 12 | ||
| 10 | Harold Tribe | 10 | Willys Mercury V8 | 10:10 | 12 | ||
| 11 | David Harvey | 35 | MG TA | 16:00 | 12 | ||
| 12 | Tony Ohlmeyer | 28 | MG TA | 15:00 | 12 | ||
| 13 | Gordon Stewart | 26 | MG L-type Magna | 14:00 | 12 | ||
| NC | Tony Gaze | 17 | HRG Aerodynamic | ? | 11 | ||
| NC | Gavin Sandford-Morgan | 27 | MG C-type s/c | 15:00 | 11 | ||
| NC | D. Howard | 39 | MG PB | 23:00 | 11 | ||
| DNF | Jack Nind | 14 | MG TB Special | 11:00 | 9 | ||
| DNF | Bill Patterson | 19 | MG TC | 12:35 | 8 | ||
| DNF | John Barraclough | 18 | MG NE Magnette | 12:35 | 7 | ||
| DNF | Doug Whiteford | 6 | Ford V8 Special[8] | 9:00 | 3 | ||
| DNF | Ern Seeliger | 2 | Itala Ford V8 | Scratch | 1 | ||
| DNS | Lex Davison | 22 | MG TC | 13:00 | - | ||
| DNS | Peter Vennermark | 9 | MG Q-type s/c | 9:35 | - |