The Prototype Challenge (PC) category was won by JDC-Miller MotorSports' Oreca FLM09 car of Misha Goikhberg and Stephen Simpson.
The Risi Competizione Ferrari 488 GTE of Toni Vilander and Giancarlo Fisichella completed the class podium in third place.
Honda continued to lead the Prototype Manufactures' Championship, but their advantage was reduced to 1 point over Chevrolet.
Simpson and Goikhberg's victory allowed them to take over the lead of the Prototype Challenge Drivers' Championship with 101 points.
Popow and van der Zande moved from third to second while the absent José Gutiérrez dropped to fifth.
The result of the race meant Gavin and Milner extended their advantage to eighteen points as Bill Auberlen and Dirk Werner took over second in the GTLM Drivers' Championship.
Chevrolet moved further ahead of Porsche in the GTLM Manufactures' Championship with nine races left in the season.
[1] It was the third consecutive year the event was held as part of the WeatherTech SportsCar Championship, and the ninth annual running of the race, counting the period between 2006 and 2013 when it was a round of the Rolex Sports Car Series and the American Le Mans Series respectively.
[1] The 2016 Tequila Patrón Sports Car Showcase was the third of twelve scheduled sports car races of 2016 by IMSA, the shortest of the season in terms of distance, and it was the first round not held as part of the North American Endurance Cup.
[4] With 66 points, PC was led by Robert Alon, Jose Gutiérrez, and Tom Kimber-Smith with a one-point advantage over Misha Goikhberg, Kenton Koch, Chris Miller, and Stephen Simpson.
[4] In GTLM, the Drivers' Championship was led by Marcel Fässler, Oliver Gavin and Tommy Milner with 72 points; the trio held a ten-point gap over Earl Bamber, Michael Christensen and Frédéric Makowiecki.
The BMW M6 GTLM received a reduction in turbo boost pressure and a change in its refuelling hose restrictor.
Since the majority of the remaining rounds of the 2016 IMSA SportsCar Championship were sprint races, teams entered their regular driver pairings for the first time this season.
[8] Mazda Motorsports had two Lola B12/80 cars and Michael Shank Racing (MSR) entered one Ligier JS P2.
Panoz brought the DeltaWing car to Long Beach for the second successive year.
[9] Tequila Patrón ESM did not participate as the team solely focused on the 2016 North American Endurance Cup.
The Prototype Challenge (PC) class was composed of seven Oreca FLM09 cars: two from Starworks Motorsports.
Regulations stipulated teams to nominate one qualifying driver, with the fastest laps determining each classes starting order.
5 AER Corvette DP took his first pole position of the season, and the 3rd of his career with a lap of 1 minutes, 14.962 seconds that he set on his fifth try.
"[24] Jordan Taylor said of the result : "I was able to pull a little bit of a gap thanks to the 31 and kind of maintain that until the end of the race.
Thankfully, we didn’t catch too much traffic in the last 10 to 15 laps and we were basically able to hold our pace and get to the end.
"[25] With a total of 93 points, Barbosa and Fittipaldi's second-place finish allowed them to take the lead of the Prototype Drivers' Championship.
[4] As a result of winning the race, Goikhberg and Simpson took the lead of the Prototype Challenge Drivers' Championship with 101 points.
[4] The final results of GTLM meant Milner and Gavin increased their gap to eighteen points as Auberlen and Werner took over the second position.
Action Express Racing and JDC-Miller Motorsports became the leaders of their respective class Teams' Championships with nine rounds left in the season.
Ricky Taylor Christian Fittipaldi Dane Cameron Joel Miller Tristan Nunez Ryan Hunter-Reay Oswaldo Negri Jr. Stephen Simpson Renger van der Zande
Kyle Marcelli Nick Tandy Johnny Mowlem Tommy Milner Giancarlo Fisichella Richard Westbrook Dirk Werner Daniel Serra Ashley Freiberg Tom Kimber-Smith