It began on January 27 with the 24 Hours of Daytona, and ended on October 13 with the Petit Le Mans.
At the end of 2017 season, the Prototype Challenge (PC) class was reduced to a support series.
[1] The Prototype class is made up of LMP2 cars both in LMP2 trim, with the ACO specification Gibson V8 engine, and in Daytona Prototype international (DPi) trim, where manufacturers are allowed to use their own engines and bodykits, designed to reflect the automaker's design language.
Acura (Oreca), Mazda (Riley Technologies), Cadillac (Dallara), and Nissan (Onroak Automotive) run chassis from the respective constructors featuring manufacturer-specific bodywork and engines.
There are also a number of manufacturer championships which utilize the same season-long point distribution chart.