The STP-Paxton Turbocar was an American racing car, designed by Ken Wallis as the STP entry in the Indianapolis 500.

Wallis and his crew moved in with Andy's brother Joe at STP's Paxton division in Santa Monica, and they began work on the turbocar in January 1966.

He agreed to drive the car in the Indianapolis 500 after being offered $100,000 cash in a briefcase and half of any prize money he won.

[1][5] The car was originally donated to the Smithsonian Institution's National Museum of American History by the STP Corporation.

There is an exact replica built from blueprints in the Indianapolis Motor Speedway Hall of Fame Museum.

The Lotus 56 used a modified version of the same engine and four-wheel drive in a more advanced wedge-shaped body with new USAC intake restrictions, but one car crashed in turn one during practice killing driver Mike Spence and the three entered into the race did not finish either; subsequently USAC banned turbines and four-wheel drive cars entirely.

In less than a month after the 1967 Indianapolis 500, USAC cut the allowable turbine air intake area from 23.999 to 15.999 square inches (103.22 cm2) and imposed the ruling immediately, although it had been customary to give two years' notice of engine changes.

[6] Television comedian Johnny Carson once drove the Turbine at the Indianapolis Motor Speedway during a private test session.

[8] Hulme competed in the race driving a car powered by a Ford Indy V8 engine, while McLaren failed to qualify.