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| Date | Grid | Clue | Author |
|---|---|---|---|
| Wednesday, March 27, 2013 | 37A | Auto additive with a red oval logo | David J. Kahn |
| Friday, December 7, 2012 | 50D | Longtime sponsor of racing's #43 car | Peter Wentz |
| Monday, July 23, 2012 | 31D | Big inits. in fuel additives | Lynn Lempel |
| Sunday, April 22, 2012 | 83D | 500 initials | Paula Gamache and Ed Stein |
| Friday, March 2, 2012 | 10A | Big race sponsor (3) | Scott Atkinson |
| Monday, December 19, 2011 | 55D | Racecar fuel additive | Richard Chisholm |
| Wednesday, October 5, 2011 | 6D | The Racer's Edge (8) | Barry Boone |
| Monday, August 15, 2011 | 41A | Auto additive brand | Stan Newman |
| Wednesday, December 15, 2010 | 50A | Indy letters (3) | John Lampkin |
| Thursday, December 2, 2010 | 24A | Onetime sponsor of Richard Petty and Mario Andretti | Joe Krozel |
| Tuesday, October 12, 2010 | 18A | Indy initials | José Chardiet |
| Saturday, October 9, 2010 | 28D | Brake fluid brand | Joe Krozel |
| Sunday, April 11, 2010 | 110D | Maker of fuel additives | Patrick Berry |
| Monday, March 29, 2010 | 6A | "The racer's edge" (8) | John Dunn |
| Monday, January 25, 2010 | 27A | "The racer's edge" (8) | Holden Baker |
| Wednesday, November 11, 2009 | 43A | Nascar sponsor (2) | Kelsey Blakley |
| Monday, November 2, 2009 | 25A | Gasoline additive | Andrea Carla Michaels and Kent Clayton |
| Saturday, February 28, 2009 | 37A | Brand of octane booster | Frank Longo |
| Tuesday, December 23, 2008 | 56A | Engine additive (2) | Joe Krozel |
| Monday, August 25, 2008 | 32A | Engine additive brand (2) | Andrea Carla Michaels and Michael Blake |
| Saturday, July 12, 2008 | 26A | 1999 Clorox acquisition | Myles Callum |
| Sunday, June 1, 2008 | 101D | Brand at a gas station | Patrick Berry |
| Tuesday, April 8, 2008 | 21A | Indy 500 inits. | Dave Mackey |
| Wednesday, January 16, 2008 | 31A | "The racer's edge" (8) | Barry C. Silk |
| Sunday, October 14, 2007 | 53A | Big car racer sponsor | Elizabeth C. Gorski |
| Friday, July 27, 2007 | 55D | Motor Up alternative | John R. Conrad |
| Tuesday, May 1, 2007 | 36D | Big inits. at Indy | Courtenay Crocker and Nancy Salomon |
| Saturday, February 3, 2007 | 20A | Product with the old jingle line "One little can will keep you running free" | Rich Norris |
| Sunday, December 31, 2006 | 92D | Speedway letters | Elizabeth C. Gorski |
| Monday, December 11, 2006 | 28D | Engine additive brand (2) | David J. Kahn |
| Sunday, November 26, 2006 | 34A | Sponsor at Indy | Manny Nosowsky |
| Friday, August 11, 2006 | 4D | Big race sponsor (3) | Patrick Merrell |
| Thursday, January 26, 2006 | 10D | Indy 500 advertiser (2) | Manny Nosowsky |
| Sunday, December 4, 2005 | 137D | Racing car product (2) | Eric Berlin and Craig Kasper |
| Wednesday, July 27, 2005 | 20A | Product at a gas station | Michael Shteyman |
| Thursday, May 19, 2005 | 23D | Big letters in racing | Barbara Olson |
| Sunday, May 15, 2005 | 107D | Longtime Nascar sponsor | Patrick Berry |
| Tuesday, May 10, 2005 | 36A | Fuel additive (2) | Nancy Salomon |
| Monday, November 1, 2004 | 31A | Indy racer sponsor | Kendall Twigg and Nancy Salomon |
| Tuesday, October 5, 2004 | 43A | Popular fuel additive | James R. Leeds |
| Thursday, September 30, 2004 | 31A | Indy letters (3) | Lee Glickstein and Nancy Salomon |
| Saturday, May 8, 2004 | 43A | Name on an oval | Bob Peoples |
| Wednesday, March 31, 2004 | 27D | "The racer's edge" (8) | Randy Sowell |
| Thursday, March 18, 2004 | 36A | Racing initials (2) | Lee Glickstein and Nancy Salomon |
| Sunday, March 14, 2004 | 138D | Big race sponsor (3) | Craig Kasper |
| Friday, March 5, 2004 | 49A | Race sponsor | Gary Steinmehl |
| Sunday, December 14, 2003 | 11A | Pit stop can | Elizabeth C. Gorski |
| Monday, November 17, 2003 | 56A | Its slogan is "The Racer's Edge" | Sarah Keller |
| Thursday, May 15, 2003 | 45A | 500 letters? | David J. Kahn |
| Sunday, May 11, 2003 | 120A | Engine-cleaning brand | Patrick Berry |
| Tuesday, April 29, 2003 | 58D | Inits. at a gas station | Norma Johnson |
| Wednesday, April 2, 2003 | 38A | Indy sponsor | Kelly Clark |
| Friday, February 21, 2003 | 49A | Crankcase additive | Patrick Berry |
| Wednesday, January 15, 2003 | 52A | Letters at a Nascar race | Brendan Emmett Quigley |
| Monday, December 23, 2002 | 47A | Fuel additive (2) | David Bunker |
| Saturday, November 30, 2002 | 10D | Racing initials (2) | Jim Page |
| Friday, October 25, 2002 | 22A | Dura Lube alternative | Brendan Emmett Quigley |
| Friday, September 13, 2002 | 19A | Certain "edge" | Mel Rosen |
| Sunday, September 1, 2002 | 98A | 500 letters | Patrick Berry |
| Monday, June 24, 2002 | 32A | Engine additive letters | Trip Payne |
| Sunday, June 16, 2002 | 68A | Initials on a Nascar car | Manny Nosowsky |
| Friday, May 17, 2002 | 5D | Car care product | Joe DiPietro |
| Saturday, May 4, 2002 | 58D | Big name in auto products | Rich Norris |
| Sunday, February 17, 2002 | 120A | Indy letters (3) | Joe DiPietro |
| Tuesday, August 21, 2001 | 64D | "The Racer's Edge" sloganeer | Sarah Keller |
| Sunday, December 24, 2000 | 28A | Product made by Armor All | Bill Zais |
| Thursday, December 21, 2000 | 62D | Fuel additive brand | Manny Nosowsky |
| Monday, December 11, 2000 | 21D | Gas station product | Myles Callum |
| Wednesday, November 1, 2000 | 31A | Big Indy 500 advertiser | Peter Gordon |
| Thursday, June 29, 2000 | 62D | Big Nascar advertiser | Robert H. Wolfe |
| Saturday, April 22, 2000 | 60D | Oil additive | Rich Norris |
| Tuesday, March 21, 2000 | 44A | Indy 500 logo | Nick Grivas |
| Tuesday, August 10, 1999 | 22D | "The Racer's Edge" (8) | Brendan Emmett Quigley |
| Sunday, June 13, 1999 | 57D | 60's-70's hallucinogen | Rich Norris |
| Saturday, March 13, 1999 | 5A | Racing car product (2) | David J. Kahn |
| Tuesday, January 26, 1999 | 52A | Popular oil additive (3) | Brendan Emmett Quigley |
| Thursday, July 9, 1998 | 44A | Indy 500 sponsor | Norman S. Wizer |
| Sunday, May 31, 1998 | 10D | Big initials at Indy | Cathy Millhauser |
| Wednesday, May 6, 1998 | 53A | "The Racer's Edge" (8) | Richard Hughes |
| Sunday, February 1, 1998 | 106D | Race car sponsor | Merl Reagle |
| Tuesday, August 5, 1997 | 23A | Popular oil additive (3) | William Bernhardt |
| Saturday, July 12, 1997 | 4D | Indy 500 letters | Richard Silvestri |
| Monday, June 2, 1997 | 50D | Nascar sponsor (2) | Gregory E. Paul |
| Thursday, April 24, 1997 | 1D | "The Racer's Edge" (8) | David J. Kahn |
| Wednesday, October 9, 1996 | 40A | Popular Formula One formula | R. Hughes |
| Monday, September 30, 1996 | 39A | Oil treatment inits. | F. Piscop |
| Sunday, September 1, 1996 | 23D | Indy 500 advertiser (2) | D. J. Kahn |
| Monday, June 10, 1996 | 25A | Engine additive: Abbr. | S. Spadaccini |
| Monday, December 12, 1994 | 38A | Popular oil additive (3) | Joy L. Wouk |
| Friday, December 9, 1994 | 10D | Gas station display | Matt Gaffney |
| Wednesday, August 17, 1994 | 50A | lndy 500 advertiser | Robert H. Wolfe |
| Saturday, January 1, 1994 | 8D | Engine additive (2) | Manny Nosowsky |
4 results for STP from Variety puzzles.
| Date | Type | Grid | Clue | Author |
|---|---|---|---|---|
| November 15, 2009 | diagramless | 34A | Letters at Indy | Fred Piscop |
| September 21, 2008 | diagramless | 56D | Speedway letters | Byron Walden |
| March 28, 2004 | diagramless | 26A | Product in a can | Brendan Emmett Quigley |
| April 5, 1998 | diagramless | 20A | Motor oil additive | Frank Longo |
7 results for STP from older pre-Shortz puzzles.
| Date | Grid | Clue | Author | Editor |
|---|---|---|---|---|
| Monday, January 18, 1993 | 24D | Post-off. item | Bert H. Kruse | Maleska |
| Sunday, March 29, 1992 | 48D | P.O. item | Ernst Theimer | Maleska |
| Sunday, October 14, 1990 | 13D | P.O. item | Nancy Scandrett Ross | Maleska |
| Sunday, April 30, 1989 | 34D | Condescend | Donald V. Lee II | Maleska |
| Sunday, February 19, 1989 | 32A | Potent hallucinogen | A. J. Santora | Maleska |
| Saturday, August 9, 1986 | 22A | P.O. item | Nancy Joline | Maleska |
| Monday, February 28, 1983 | 29A | P.O. item | Bolognese-Lo | Maleska |