Porsche had dominated the Prologue as well as the first two practice sessions for the 10-hour fixture at Qatar with its 963 LMDh, but Cadillac surged ahead in relatively hotter conditions on Friday morning.
Alex Lynn set a time of 1m40.667s in the Chip Ganassi-entered Cadillac V-Series.R at the beginning of 60-minute FP3, overhauling the #5 Porsche Penske car of Matt Campbell by 0.180s.
