Throughout that decade, the STP sticker became a badge of racing honor, from the Bonneville Salt Flats to the drag strips of the NHRA. The logo and the abbreviation became part of American culture.

They left a rich visual record in the form of decals and logos that they used to promote ... and early 70s could have escaped hearing about STP—the racer's edge! Such was the effectiveness ...

NASCAR contingency sponsor stickers on the fender of Richard Petty's #43 STP Pontiac (Source ... to NASCAR teams in exchange for placing their logo decals on the front of race cars.