Porsche held first and second place at the Nurburgring as the fourth round of the World Endurance Championship reached its three-hour point.
Having just completed the third round of LMP1 pit stops, Nick Tandy held a 5.796s advantage over Earl Bamber in the sister 919 Hybrid.
The pair recently took over from Neel Jani and Brendon Hartley respectively, who battled for the lead during the second hour.
Jani overtook Hartley on lap 69 following the second round of stops, breaking the order of the two cars that had stood since the start of the race.
Jose Maria Lopez led in the pole-sitting Toyota until lap 41, when Hartley made a clean lunge down the inside at the sharp first corner.
Lopez, who took over from the #7 car's starting driver Kamui Kobayashi, then fell back to third behind the now-leading Porsche before handing over to Mike Conway.
At the close of hour three, Conway was 27 seconds off the lead.
The sister Toyota, started by Sebastien Buemi, had a nightmarish start when it suffered a fuel pressure problem on the formation lap.
Buemi managed to nurse the car back to the pits but lost six laps in repairs, before recovering through the LMP2 field.
Anthony Davidson was at the helm as the halfway mark passed, with the #8 car circulating four laps adrift.
Result: 6 Hours of Nurburgring after three hours
In LMP2, Ho-Pin Tung led for the Jackie Chan DC Racing outfit with a 50 second lead to the sister car driven by Tristan Gommendy.
Despite losing the lead to the pair of Vaillante Rebellion ORECAs at the start, Tung's team-mate Oliver Jarvis recovered to pass Mathias Beche (#13) in the pits and Bruno Senna (#31) on the run down to the final chicane during hour two.
Gommendy emerged at the front of a terrific battle between his #38 Jackie Chan car, the #36 Signatech Alpine, and the pair of Rebellions, which partly allowed Tung to build such a large gap.
Porsche's pole-sitting 911 RSR of Kevin Estre and Michael Christensen led the GTE-Pro race into its second half, with the #51 Ferrari close behind.
Aston Martin fronted the class field initially after Christensen locked up at the first corner, allowing Marco Sorensen to move ahead, but waning grip levels on the AMR Vantage's tyres enabled the Porsche crew to regain the ascendancy.
Porsche also held sway in GTE-Am, after Matteo Cairoli (Proton Competition 911 RSR) overtook Mathias Lauda in the #98 Aston Martin that had commanded the race since the start.
