Index of Effluency is the top prize awarded in a series of endurance races that  holds the Guinness World Record for what?
Index of Effluency Index of Effluency (or IOE) is the top prize awarded in the 24 Hours of LeMons automotive racing series. General criteria to win this award is a car that is too unreliable to be driven effectively on the streets yet manages to complete a decent amount of laps on the race track. IOE can be awarded to a vehicle that was deemed unreliable from the factory (e.g. Volkswagen Karmann Ghia) or a more reliable car with an unwise engine transplant (e.g. Ford Thunderbird with a BMW diesel engine).
2016 24 Hours of Le Mans The 84th 24 Hours of Le Mans (French: "84 24 Heures du Mans" ) was an automobile endurance event held from 15 to 19 June 2016 at the Circuit de la Sarthe, Le Mans, France. It was the 84th running of the 24 Hour race organised by the Automobile Club de l'Ouest as well as the third round of the 2016 FIA World Endurance Championship. A test day was held two weeks prior to the race on 5 June.