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Wetteroth was an American racing car constructor, owned and operated by California-based Texan Louis "Curly" Wetteroth. [1] Wetteroth cars won four Indianapolis 500s (1932, 1935, 1938, 1941) and competed in one FIA World Championship race (1950 Indianapolis 500).
| Season | Driver | Grid | Finish | Points | Note | Report | 
|---|---|---|---|---|---|---|
| 1932 | Fred Frame | 27 | 1 | 600 | Report [2] | |
| 1933 | Fred Frame | 3 | 29 | Report | ||
| 1935 | Kelly Petillo | 22 | 1 | 600 | Gilmore Speedway Special | Report [3] | 
| 1936 | Ted Horn | 11 | 2 | Report | ||
| Doc MacKenzie | 4 | 3 | ||||
| Louis Tomei | 8 | 27 | ||||
| 1937 | Ted Horn | 32 | 3 | Report | ||
| Ken Fowler | 29 | 19 | ||||
| Kelly Petillo | 20 | 20 | ||||
| 1938 | Floyd Roberts | 1 | 1 | 600 | Burd Piston Ring Special | Report [4] | 
| Ted Horn | 6 | 4 | ||||
| Kelly Petillo | 21 | 22 | ||||
| 1939 | Frank Wearne | 17 | 9 | Report | ||
|  Herb Ardinger  Frank Brisko Mel Hansen  | 9 | 17 | ||||
| Kelly Petillo | 24 | 18 | ||||
| Floyd Roberts | 23 | 23 | ||||
| 1940 | Mauri Rose | 3 | 3 | Report | ||
| Mel Hansen | 5 | 8 | ||||
| Kelly Petillo | 13 | 21 | ||||
| Cliff Bergere | 6 | 27 | ||||
| 1941 |  Floyd Davis  Mauri Rose [5]  | 17 | 1 | 600 | Noc-Out Hose Clamp Special (shared) | Report [6] | 
| Cliff Bergere | 7 | 5 | ||||
|  Al Putnam  Louis Durant  | 31 | 12 | ||||
| Kelly Petillo | 19 | 27 | ||||
| 1946 |  Joie Chitwood  Sam Hanks  | 12 | 5 | Report | ||
| Billy Devore | 31 | 10 | ||||
| Cliff Bergere Rex Mays  | 1 | 16 | ||||
| 1947 |  Duke Dinsmore  Billy Devore  | 27 | 10 | Report | ||
| Roland Free | 12 | 17 | ||||
| Joie Chitwood | 22 | 22 | ||||
| 1948 | Duane Carter | 29 | 22 | Report | ||
| Mike Salay | 31 | 30 | ||||
| 1949 | Jim Rathmann | 21 | 11 | Report | ||
| Troy Ruttman | 18 | 12 | ||||
| 1950 | Jim Rathmann | 28 | 24 | Report | ||
| Bob Sweikert | DNQ | |||||