2016 Oak Tree Grand Prix

The 2016 Michelin GT Challenge at VIR was a sports car race sanctioned by the International Motor Sports Association (IMSA). The Race was held at Virginia International Raceway in Alton, Virginia on August 28, 2016. The race was the tenth round of the 2016 IMSA SportsCar Championship.

Preview
International Motor Sports Association (IMSA) president Scott Atherton confirmed the race was part of the schedule for the 2016 IMSA SportsCar Championship (IMSA SCC) in August 2015. It was the third consecutive year the event was held as part of the WeatherTech SportsCar Championship. The 2016 Northeast Grand Prix was the tenth of twelve scheduled sports car races of 2016 by IMSA, and was the seventh round not held on the held as part of the North American Endurance Cup. The race was held at the ten-turn 3.270 mi Virginia International Raceway in Alton, Virginia on August 28, 2016.

IMSA altered the balance of performance to try to create parity within the GTLM and GTD categories. The BMW M6 GTLM's refuelling hose restrictor was increased by 1 mm. The Ferrari 488 GTE and Ford GT's refuelling hose restrictor was shortened by 0.5 mm. Audi's R8 LMS had its refuelling hose restrictor increased by 0.5 mm. The Dodge Viper GT3-R and Ferrari 488 GT3 had their refuelling hose restrictor shortened by 0.5 mm. The Lamborghini Huracán GT3's refuelling hose restrictor was shortened by 1.5 mm.

Entry list
Twenty-one cars were officially entered for the Michelin GT Challenge at VIR, with most of the entries being in the Grand Touring Daytona (GTD) category. GTLM was represented by nine entries from five different brands. In the list of GTD entrants, twelve GT3-specification vehicles were represented by six different manufacturers. Alex Job Racing's No. 22 and Park Place Motorsports No. 73 Porsche's withdrew over balance of performance concerns. Although it was listed as an entrant, Black Swan Racing's No. 540 car was withdrawn due to family obligations for Tim Pappas. Lone Star Racing made their first appearance since the Laguna Seca round. With the absence of the Prototype (P) and Prototype Challenge (PC) classes from the field, only two racing classes were represented in Virginia International Raceway.

Practice
There were three practice sessions preceding the start of the race on Sunday, two on Friday and one on Saturday. The first two one-hour sessions were on Friday morning and afternoon. The third on Saturday morning lasted an hour.

In the first practice session, Bamber's No. 912 Porsche 911 RSR lapped quickest at 1:43.232, 0.018 seconds ahead of Joey hand in the No. 66 CGR car. García was third fastest in Corvette Racing's No. 3 car, Briscoe's No. 67 Ford GT placed fourth and Giancarlo Fisichella's Risi Ferrari rounded out the top five. Lamborghini paced GTD with Paul Miller's Huracán of Madison Snow lapping 1:45.722, ahead of Spencer Pumpelly's Change Lamborghini. The session had two stoppages. The first was when the No. 25 Team RLL BMW M6 GTLM lost its roof on track. A spin by Davis' No. 6 Stevenson Audi into the turn-fifteen barriers gave right-side damage and caused the second stoppage.

The second practice session saw García lap quickest for Corvette at 1:42.623. Ford were second and third after laps by Hand and Briscoe. GTD saw Bryan Sellers No. 48 Paul Miller Lamborghini record the quickest class lap: 1:44.944, 0.165 seconds faster than Bleekemolen's second-placed No. 33 Riley Motorsport Viper.

In the last practice session, Magnussen went fastest for Corvette at 1:41.637. Müller's No. 66 CGR car was second, followed by RLL's Werner in third. Risi were fourth after a lap by Fisichella, and Westbrook No. 67 CGR Ford GT rounded out the top five. Lamborghini took the first two GTD positions, led by Paul Miller's No. 48 car driven by Snow (whose benchmark time of 1:43.864 was 0.262 seconds quicker than Corey Lewis' No. 16 Change Lamborghini).

Qualifying
Saturday afternoon's 40-minute two-group qualifying session gave 15-minute sessions to all categories. Cars in GTD were sent out first before those grouped in GTLM had a separate identically timed session. Regulations stipulated teams to nominate one qualifying driver, with the fastest laps determining each classes starting order. IMSA would arranged the grid to put all GTLMs ahead of the GTD cars.

Qualifying results
Pole positions in each class are indicated in bold and by ‡.


 * The No. 23 AJR, No. 67 CGR, and No. 80 Lone Star Racing entries were sent to the rear of their respective class fields as per 40.1.5 of the Sporting regulations (Tire change).

Race Results
Class winners are denoted in bold and ‡.