Toyota won the Shanghai round of the World Endurance Championship as Porsche's Brendon Hartley, Earl Bamber and Timo Bernhard secured the drivers' title one round early.
Second place was enough to confirm the Porsche crew as champions, while Sebasien Buemi, Anthony Davidson and Kazuki Nakajima scored Toyota's fourth victory of the season.
Toyota was on course for a comfortable one-two finish when leader Jose Maria Lopez crashed out in the final hour.
The three-time World Touring Car champion tagged a GT Porsche whilst negotiating the long turn 13 right-hander, which damaged the left side of the TS050.
Lopez then lost seven laps in the pits as Buemi picked up the pieces to claim victory by a lap from Bernhard.
Toyota needed a one-two to keep the manufacturers' title race open until the final round in Bahrain later this month, but instead the crown went to Porsche for the third year in a row.
Despite securing all available WEC titles, Porsche's pair of 919 Hybrids struggled to match the Toyotas all afternoon.
The Japanese manufacturer was running a series of aerodynamic upgrades in a bid to out-score its counterpart in race wins this season, which translated into superior pace around the 3.4-mile Shanghai circuit.
The title-winning Porsche dropped off the lead lap during the fourth hour, while the sister 919 finished a distant third after challenging for the lead early on.
Nick Tandy was running second when he encountered a sensor issue that reduced the #1 machine to a crawl along the back straight, and despite being able to fix it himself the British driver dropped off the lead lap.
RESULT: WEC 6 Hours of Shanghai
In LMP2, Vaillante Rebellion's Bruno Senna and Julien Canal superseded Jackie Chan DC Racing's Thomas Laurent, Oliver Jarvis and Ho-Pin Tung in the standings with one round remaining.
The Rebellion pair, joined in China by Nicolas Prost, dominated the six-hour contest to chalk up their third win in four races.
The Jota Sport-run Jackie Chan squad, meanwhile, finished down in — after needing a late splash for fuel.
Watched on by team co-founder Jackie Chan, the #38 ORECA also suffered two spins during the race following contact with other LMP2 cars.
GTE-Pro honours went to the Ganassi Ford GT driven by Andy Priaulx and Harry Tincknell.
The British pair emerged victorious from a duel with the Porsche 911 RSR of Richard Lietz and Frederic Makowiecki during the second half of the race.
Priaulx overtook Lietz early in the fourth hour before pulling away, although a late splash of fuel brought the Ford back into the Porsche's sights.
Lietz's incident with Lopez near the end put paid to a final flurry of racing, leaving Priaulx to take the chequered flag by a margin of 11 seconds.
The opening three hours were a contest between Ford and Porsche's other entries, although an engine failure for the Kevin Estre/Michael Christensen 911 and a loose door fitting for the Olivier Pla/Stefan Mucke Ford switched the direction of the fight.
Pla and Mucke recovered from their technical glitch and finished fourth behind the AF Corse Ferrari of James Calado and Alessandro Pier Guidi.
The Ferrari duo are now tied on points with Lietz and Makowiecki heading into the 6 Hours of Bahrain finale.
Honours in GTE-Am went the way of Aston Martin Racing's Pedro Lamy, Paul Dalla Lana and Mathias Lauda, who reclaimed the lead of the championship from the Dempsey Proton Porsche crew.
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