# 2015 Oak Tree Grand Prix

The 2015 Oak Tree Grand Prix 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 23, 2015. The race was the tenth round of the 2015 United SportsCar Championship.

## Background
### Preview

International Motor Sports Association (IMSA) president Scott Atherton confirmed the race was part of the schedule for the 2015 IMSA Tudor United SportsCar Championship (IMSA TUSC) in August 2014. It was the second consecutive year the event was held as part of the United SportsCar Championship. The 2015 Oak Tree Grand Prix was the tenth of twelve scheduled sports car races of 2015 by IMSA, and was the seventh round not held as part of the North American Endurance Cup. The race was held at the seventeen-turn 3.270 mi (5.263 km) Virginia International Raceway in Alton, Virginia on August 23, 2015. The PC category was dropped from the event.

### Entry list

Eighteen cars were officially entered for the Oak Tree Grand Prix, with most of the entries being in the Grand Touring Daytona (GTD) category. GTLM was represented by eight entries from four different brands. In the list of GTD entrants, ten GT-specification vehicles were represented by six different manufacturers. 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.

## 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 class starting order. IMSA would arrange the grid to put all GTLMs ahead of the GTD cars.

### Qualifying results

Pole positions in each class are indicated in bold and by ‡. GTLM stands for Grand Touring Le Mans and GTD (Grand Touring Daytona).
| Pos. | Class | No. | Team | Driver | Time | Gap | Grid |
| 1 | GTLM | 911 | Porsche North America | Nick Tandy | 1:42.532 | _ | 1‡ |
| 2 | GTLM | 912 | Porsche North America | Jörg Bergmeister | 1:42.629 | +0.097 | 2 |
| 3 | GTLM | 62 | Risi Competizione | Pierre Kaffer | 1:43.122 | +0.590 | 3 |
| 4 | GTLM | 24 | BMW Team RLL | Lucas Luhr | 1:43.324 | +0.792 | 4 |
| 5 | GTLM | 25 | BMW Team RLL | Bill Auberlen | 1:43.356 | +0.824 | 5 |
| 6 | GTLM | 3 | Corvette Racing | Jan Magnussen | 1:43.568 | +1.036 | 6 |
| 7 | GTLM | 4 | Corvette Racing | Tommy Milner | 1:43.797 | +1.265 | 7 |
| 8 | GTLM | 17 | Team Falken Tire | Bryan Sellers | 1:44.134 | +1.602 | 8 |
| 9 | GTD | 48 | Paul Miller Racing | Dion von Moltke | 1:49.255 | +6.723 | 9‡ |
| 10 | GTD | 73 | Park Place Motorsports | Patrick Lindsey | 1:49.265 | +6.733 | 10 |
| 11 | GTD | 63 | Scuderia Corsa | Bill Sweedler | 1:49.512 | +6.980 | 11 |
| 12 | GTD | 33 | Riley Motorsports | Ben Keating | 1:49.837 | +7.305 | 12 |
| 13 | GTD | 007 | TRG-AMR North America | Christina Nielsen | 1:50.080 | +7.548 | 13 |
| 14 | GTD | 23 | Team Seattle / Alex Job Racing | Ian James | 1:50.253 | +7.721 | 14 |
| 15 | GTD | 44 | Magnus Racing | John Potter | 1:50.497 | +7.965 | 15 |
| 16 | GTD | 22 | Alex Job Racing | Cooper MacNeil | 1:50.882 | +8.350 | 16 |
| 17 | GTD | 97 | Turner Motorsport | Michael Marsal | 1:51.330 | +8.798 | 17 |
| 18 | GTD | 76 | Compass360 Racing | Ray Mason | 1:53.078 | +10.546 | 18 |
| Sources: ||||||||

## Race
### Race Results

Class winners are denoted in bold and ‡. GTLM stands for Grand Touring Le Mans and GTD (Grand Touring Daytona).
Final race classification :
| Pos | Class | No. | Team | Drivers | Chassis | Tire | Laps | Time/Retired |
| Pos | Class | No. | Team | Drivers | Engine | Tire | Laps | Time/Retired |
| 1 | GTLM | 911 | Porsche North America | Patrick Pilet Nick Tandy | Porsche 911 RSR | M | 92 | 2:40:57.210‡ |
| 1 | GTLM | 911 | Porsche North America | Patrick Pilet Nick Tandy | Porsche 4.0 L Flat-6 | M | 92 | 2:40:57.210‡ |
| 2 | GTLM | 912 | Porsche North America | Earl Bamber Jörg Bergmeister | Porsche 911 RSR | M | 92 | +27.267 |
| 2 | GTLM | 912 | Porsche North America | Earl Bamber Jörg Bergmeister | Porsche 4.0 L Flat-6 | M | 92 | +27.267 |
| 3 | GTLM | 62 | Risi Competizione | Pierre Kaffer Giancarlo Fisichella | Ferrari 458 Italia GT2 | M | 92 | +27.842 |
| 3 | GTLM | 62 | Risi Competizione | Pierre Kaffer Giancarlo Fisichella | Ferrari 4.5 L V8 | M | 92 | +27.842 |
| 4 | GTLM | 24 | BMW Team RLL | John Edwards Lucas Luhr | BMW Z4 GTE | M | 92 | +1:01.282 |
| 4 | GTLM | 24 | BMW Team RLL | John Edwards Lucas Luhr | BMW 4.4 L V8 | M | 92 | +1:01.282 |
| 5 | GTLM | 25 | BMW Team RLL | Bill Auberlen Dirk Werner | BMW Z4 GTE | M | 92 | +1:16.723 |
| 5 | GTLM | 25 | BMW Team RLL | Bill Auberlen Dirk Werner | BMW 4.4 L V8 | M | 92 | +1:16.723 |
| 6 | GTLM | 3 | Corvette Racing | Antonio García Jan Magnussen | Chevrolet Corvette C7.R | M | 92 | +1:22.358 |
| 6 | GTLM | 3 | Corvette Racing | Antonio García Jan Magnussen | Chevrolet LT5.5 5.5 L V8 | M | 92 | +1:22.358 |
| 7 | GTLM | 17 | Team Falken Tire | Bryan Sellers Wolf Henzler | Porsche 911 RSR | F | 91 | +1 lap |
| 7 | GTLM | 17 | Team Falken Tire | Bryan Sellers Wolf Henzler | Porsche 4.0 L Flat-6 | F | 91 | +1 lap |
| 8 | GTLM | 4 | Corvette Racing | Oliver Gavin Tommy Milner | Chevrolet Corvette C7.R | M | 91 | +1 lap |
| 8 | GTLM | 4 | Corvette Racing | Oliver Gavin Tommy Milner | Chevrolet LT5.5 5.5 L V8 | M | 91 | +1 lap |
| 9 | GTD | 63 | Scuderia Corsa | Bill Sweedler Townsend Bell | Ferrari 458 Italia GT3 | C | 88 | +4 Laps‡ |
| 9 | GTD | 63 | Scuderia Corsa | Bill Sweedler Townsend Bell | Ferrari 4.5 L V8 | C | 88 | +4 Laps‡ |
| 10 | GTD | 007 | TRG-AMR North America | Christina Nielsen Kuno Wittmer | Aston Martin V12 Vantage GT3 | C | 87 | +5 Laps |
| 10 | GTD | 007 | TRG-AMR North America | Christina Nielsen Kuno Wittmer | Aston Martin 6.0 L V12 | C | 87 | +5 Laps |
| 11 | GTD | 23 | Team Seattle / Alex Job Racing | Mario Farnbacher Ian James | Porsche 911 GT America | C | 87 | +5 Laps |
| 11 | GTD | 23 | Team Seattle / Alex Job Racing | Mario Farnbacher Ian James | Porsche 4.0 L Flat-6 | C | 87 | +5 Laps |
| 12 | GTD | 97 | Turner Motorsport | Michael Marsal Markus Palttala | BMW Z4 GT3 | C | 87 | +5 Laps |
| 12 | GTD | 97 | Turner Motorsport | Michael Marsal Markus Palttala | BMW 4.4 L V8 | C | 87 | +5 Laps |
| 13 | GTD | 48 | Paul Miller Racing | Christopher Haase Dion von Moltke | Audi R8 LMS ultra | C | 87 | +5 Laps |
| 13 | GTD | 48 | Paul Miller Racing | Christopher Haase Dion von Moltke | Audi 5.2 L V10 | C | 87 | +5 Laps |
| 14 | GTD | 22 | Alex Job Racing | Leh Keen Cooper MacNeil | Porsche 911 GT America | C | 87 | +5 Laps |
| 14 | GTD | 22 | Alex Job Racing | Leh Keen Cooper MacNeil | Porsche 4.0 L Flat-6 | C | 87 | +5 Laps |
| 15 | GTD | 33 | Riley Motorsports | Jeroen Bleekemolen Ben Keating | Dodge Viper GT3-R | C | 87 | +5 Laps |
| 15 | GTD | 33 | Riley Motorsports | Jeroen Bleekemolen Ben Keating | Dodge 8.3 L V10 | C | 87 | +5 Laps |
| 16 | GTD | 76 | Compass360 Racing | Pierre Kleinubing Ray Mason | Audi R8 LMS ultra | C | 83 | +9 Laps |
| 16 | GTD | 76 | Compass360 Racing | Pierre Kleinubing Ray Mason | Audi 5.2 L V10 | C | 83 | +9 Laps |
| 17 DNF | GTD | 44 | Magnus Racing | John Potter Andy Lally | Porsche 911 GT America | C | 51 | Vibration |
| 17 DNF | GTD | 44 | Magnus Racing | John Potter Andy Lally | Porsche 4.0 L Flat-6 | C | 51 | Vibration |
| 18 DNF | GTD | 73 | Park Place Motorsports | Patrick Lindsey Spencer Pumpelly | Porsche 911 GT America | C | 34 | Cooling |
| 18 DNF | GTD | 73 | Park Place Motorsports | Patrick Lindsey Spencer Pumpelly | Porsche 4.0 L Flat-6 | C | 34 | Cooling |
| Sources: |||||||||
Tyre manufacturers :
| Key ||
| Symbol | Tyre manufacturer |
| C | Continental |
| M | Michelin |
| F | Falken Tire |