The No. 32 United Autosports Ligier JS P217 Gibson of Bruno Senna is out front of the Sahlen’s Six Hours of the Glen at the halfway mark, although is due a pit stop.
Senna holds a ten-second lead over the No. 6 Team Penske Acura ARX-05 of Juan Pablo Montoya, who along with Dane Cameron have dominated the race so far.
Quick pit work for No. 7 Penske Acura DPi put Helio Castroneves briefly into the lead until the car made an unscheduled stop with gearbox issues.
It has dropped six laps behind after multiple stops.
The No. 52 AFS/PR1 Mathiasen Motorsports Ligier of Will Owen runs in third, ahead of Romain Dumas, who spun his No. 54 CORE autosport Oreca 07 Gibson after contact with the No. 93 Meyer Shank Racing Acura NSX GT3 of Justin Marks.
The MSR car has since been retired due to a broken tie-rod, although no penalty was issued.
Porsche runs 1-2 in GT Le Mans, with the pair of CORE autosport-run Porsche 911 RSRs coming alive in the hotter mid-day temperatures.
Patrick Pilet blasted around the class pole-sitting No. 67 Ford GT of Ryan Briscoe in the third hour, with Briscoe since fading to fourth, behind the No. 66 Ford of Dirk Mueller.
GT Daytona, meanwhile, is led by the No. 48 Paul Miller Racing Lamborghini Huracan GT3 of Bryan Sellers.
It came after the No. 29 Montaplast by Land Motorsport Audi R8 LMS of Sheldon van der Linde ran out of fuel while in the class lead, dropping the German squad down the running order.
The No. 14 3GT Racing Lexus RC F GT3, which was also a front-runner in class, went behind the wall in the second hour with a fuel pump issue.