The tale of the STP Oil Treatment Special turbine Indycar is one of gamesmanship and technical innovation, with a liberal sprinkling of mercenary opportunism. It wasn't the first turbine car to turn up at Indy, and nor was it the last. But it's certainly the most notorious.
The car was built in secrecy for famed owner Andy Granatelli, and over the course of May 1967, it snowballed from a curiosity as the first turbine-powered entry to qualify for the 500, to one of the most controversial machines in the event's history when it came within just a few miles of actually winning.
Its flamboyance was entirely in keeping with Granatelli's natural showman's instincts: four-wheel drive, centrally-located fuel-tank, and a mid-mounted Pratt-Whitney helicopter engine - reportedly good for 550bhp - that sat right alongside driver Parnelli Jones.