Looks like the #4 cars overheating problems are terminal. Second full course yellow as the #31 Cadillac prototype makes contact with the #22 Nissan prototype and spins. At about two and a half hours in:

Prototype—now Cadillac #5, Cadillac #10, Oreca #85

Prototype Challenge—now Oreca #38 (10th overall), Oreca #8, Oreca #20

GT Le Mans—now Ford #66 (13th overall), Corvette #3, Ferrari #62

GT Daytona—now Mercedes #33 (22nd overall), Audi #29, Mercedes #50