| 2025 | Felipe Nasr, Nick Tandy, Laurens Vanthoor | Porsche 963 | Porsche Penske Motorsport (#7) |
| 2024 | Pipo Derani, Alexander Sims, Jack Aitken | Cadillac V-Series.R | Action Express Racing (#31) |
| 2023 | Tom Blomqvist, Colin Braun, Helio Castroneves, Simon Pagenaud | Acura ARX-06 | Meyer Shank Racing (#60) |
| 2022 | Tom Blomqvist, Oliver Jarvis, Helio Castroneves, Simon Pagenaud | Acura ARX-05 | Meyer Shank Racing (#60) |
| 2021 | Felipe Nasr, Pipo Derani, Mike Conway | Cadillac DPi-V.R | Action Express Racing (#31) |
| 2020 | Ryan Briscoe, Renger van der Zande, Scott Dixon, Kamui Kobayashi | Cadillac DPi-V.R | Chip Ganassi Racing (#10) |
| 2019 | Fernando Alonso, Kamui Kobayashi, Jordan Taylor, Renger van der Zande | Cadillac DPi-V.R | Wayne Taylor Racing (#10) |
| 2018 | Renger van der Zande, Jordan Taylor, Ryan Hunter-Reay | Cadillac DPi-V.R | Wayne Taylor Racing (#10) |
| 2017 | Ricky Taylor, Jordan Taylor, Max Angelelli, Jeff Gordon | Cadillac DPi-V.R | Wayne Taylor Racing (#10) |
| 2016 | Scott Dixon, Tony Kanaan, Kyle Larson, Jamie McMurray | Ford EcoBoost-Riley | Chip Ganassi Racing (#02) |
| 2015 | João Barbosa, Christian Fittipaldi, Sébastien Bourdais | Corvette DP | Action Express Racing (#5) |
| 2014 | Christian Fittipaldi, João Barbosa, Sébastien Bourdais | Corvette DP | Action Express Racing (#5) |
| 2013 | Scott Pruett, Memo Rojas, Juan Pablo Montoya, Charlie Kimball | Riley-BMW | Chip Ganassi Racing (#01) |
| 2012 | Oswaldo Negri, John Pew, Justin Wilson, A. J. Allmendinger | Riley-Ford | Michael Shank Racing (#60) |
| 2011 | Joey Hand, Graham Rahal, Scott Pruett, Memo Rojas | Riley-BMW | Chip Ganassi Racing (#01) |
| 2010 | Scott Pruett, Memo Rojas, Justin Wilson, Joey Hand | Riley-BMW | Chip Ganassi Racing (#01) |
| 2009 | David Donohue, Antonio García, Darren Law, Buddy Rice | Porsche-Riley | Brumos Racing (#58) |
| 2008 | Juan Pablo Montoya, Scott Pruett, Memo Rojas | Riley-Lexus | Chip Ganassi Racing (#01) |
| 2007 | Scott Pruett, Juan Pablo Montoya, Salvador Durán | Riley-Lexus | Chip Ganassi Racing (#01) |
| 2006 | Scott Pruett, Max Papis, Luis Díaz | Riley-Lexus | Chip Ganassi Racing (#01) |
| 2005 | Wayne Taylor, Max Angelelli, Emmanuel Collard | Riley-Pontiac | SunTrust Racing (#10) |
| 2004 | Terry Borcheller, Forest Barber, Andy Pilgrim, Christian Fittipaldi | Doran-Pontiac | The Racer’s Group / Doran (#54) |
| 2003 | Kevin Buckler, Michael Schrom, Timo Bernhard, Jörg Bergmeister | Porsche 911 GT3-RS | The Racer’s Group (#66) |
| 2002 | Didier Theys, Fredy Lienhard, Mauro Baldi, Max Papis | Dallara SP1-Judd | Doran Lista Racing (#27) |
| 2001 | Ron Fellows, Chris Kneifel, Franck Fréon, Johnny O’Connell | Chevrolet Corvette C5-R | Corvette Racing (#2) |
| 2000 | Olivier Beretta, Karl Wendlinger, Dominique Dupuy | Dodge Viper GTS-R | Team Oreca (#91) |
| 1999 | Elliott Forbes-Robinson, Butch Leitzinger, Andy Wallace | Riley & Scott-Ford | Dyson Racing (#20) |
| 1998 | Mauro Baldi, Arie Luyendyk, Andy Wallace | Ferrari 333 SP | Doyle-Risi Racing (#30) |
| 1997 | Yannick Dalmas, Karl Wendlinger, Scott Goodyear | Porsche 911 GT1 | Rohr Motorsport (#7) |
| 1996 | Wayne Taylor, Scott Sharp, Jim Pace | Riley & Scott Mk III-Oldsmobile | Doyle Racing (#4) |
| 1995 | Jürgen Lässig, Christophe Bouchut, Giovanni Lavaggi, Marco Werner | Kremer K8-Porsche | Kremer Racing (#10) |
| 1994 | Steve Millen, Johnny O’Connell, John Morton | Nissan 300ZX | Cunningham Racing (#75) |
| 1993 | P. J. Jones, Mark Dismore, Rocky Moran | Eagle MkIII-Toyota | All American Racers (#98) |
| 1992 | Masahiro Hasemi, Kazuyoshi Hoshino, Toshio Suzuki | Nissan R91CP | Nissan Motorsport (#23) |
| 1991 | Hurley Haywood, Frank Jelinski, John Winter, Henri Pescarolo, Bob Wollek | Porsche 962C | Joest Racing (#7) |
| 1990 | Davy Jones, Jan Lammers, Andy Wallace | Jaguar XJR-12 | Tom Walkinshaw Racing (#61) |
| 1989 | John Andretti, Derek Bell, Bob Wollek | Porsche 962 | Busby Racing (#67) |
| 1988 | Martin Brundle, Raul Boesel, John Nielsen | Jaguar XJR-9 | Tom Walkinshaw Racing (#60) |
| 1987 | Chip Robinson, Derek Bell, Al Holbert, Al Unser Jr. | Porsche 962 | Holbert Racing (#14) |
| 1986 | Al Holbert, Derek Bell, Al Unser Jr. | Porsche 962 | Holbert Racing (#14) |
| 1985 | A. J. Foyt, Bob Wollek, Al Unser, Thierry Boutsen | Porsche 962 | Henn’s T-Bird Swap Shop (#3) |
| 1984 | Sarel van der Merwe, Tony Martin, Graham Duxbury | March 83G-Porsche | Kreepy Krauly Racing (#00) |
| 1983 | Preston Henn, Bob Wollek, Claude Ballot-Léna, A. J. Foyt | Porsche 935 | Henn’s T-Bird Swap Shop (#6) |
| 1982 | John Paul Sr., John Paul Jr., Rolf Stommelen | Porsche 935 | JLP Racing (#18) |
| 1981 | Bob Garretson, Bobby Rahal, Brian Redman | Porsche 935 | Garretson Enterprises (#9) |
| 1980 | Rolf Stommelen, Volkert Merl, Reinhold Joest | Porsche 935 | Joest Racing (#0) |
| 1979 | Hurley Haywood, Ted Field, Danny Ongais | Porsche 935 | Interscope Racing (#0) |
| 1978 | Rolf Stommelen, Toine Hezemans, Peter Gregg | Porsche 935 | Brumos Racing (#99) |
| 1977 | Hurley Haywood, John Graves, Dave Helmick | Porsche Carrera RSR | Ecurie Escargot (#43) |
| 1976 | Brian Redman, Peter Gregg, John Fitzpatrick | BMW 3.5 CSL | BMW of North America (#59) |
| 1975 | Peter Gregg, Hurley Haywood | Porsche Carrera RSR | Brumos Racing (#59) |
| 1974 | no race (oil crisis) | — | — |
| 1973 | Peter Gregg, Hurley Haywood | Porsche Carrera RSR | Brumos Racing (#59) |
| 1972 | Mario Andretti, Jacky Ickx | Ferrari 312 PB | SEFAC Ferrari (#2) |
| 1971 | Pedro Rodríguez, Jackie Oliver | Porsche 917K | JW Automotive (#2) |
| 1970 | Pedro Rodríguez, Leo Kinnunen, Brian Redman | Porsche 917K | JW Automotive (#2) |
| 1969 | Mark Donohue, Chuck Parsons | Lola T70-Chevrolet | Roger Penske Racing (#6) |
| 1968 | Vic Elford, Jochen Neerpasch, Rolf Stommelen, Jo Siffert, Hans Herrmann | Porsche 907 | Porsche System Engineering (#54) |
| 1967 | Lorenzo Bandini, Chris Amon | Ferrari 330 P4 | SEFAC Ferrari (#23) |
| 1966 | Ken Miles, Lloyd Ruby | Ford GT40 Mk II | Shelby American (#98) |
| 1965 | Ken Miles, Lloyd Ruby | Ford GT | Shelby American (#11) |
| 1964 | Pedro Rodríguez, Phil Hill | Ferrari 250 GTO | NART (#22) |
| 1963 | Pedro Rodríguez | Ferrari 250 GTO | NART (#6) |
| 1962 | Dan Gurney | Lotus 19-Climax | Arciero Brothers Racing (#96) |