|Potentially the most expensive car to ever go to auction at Christie’s, the 1939 Audi Auto Union Type D was expected to sell for as much as $12 million. It was eventually acquired by Audi for an undisclosed price. There is so much history in the Auto Union Type D. To begin with, the car’s design was produced by none other than Ferdinand Porsche. The rear-engine design delivered unpredictable oversteer and Porsche attempted to counter this with a swing half-axle suspension before following the Mercedes lead and going with a de Dion system. The twin-supercharger V-12 delivered amazing horsepower and was known to break the rear tires loose at 100 mph. Tire slippage was an issue addressed by another Porsche innovation, the limited-slip differential. All this technology was developed during a period of state-sponsored motor racing. The success of the Auto Union Type D was ended by the course of Germany and World War II. When the war was over several Auto Union team cars were found by invading Russian Army forces and taken as spoils of war. These cars were disassembled and studied by the Soviets until, in the 1980s, American car enthusiast Paul Karassik tracked down chassis number 19 and many Type D original parts. Karassik handed over the collection to noted restoration shop Crosthwaite and Gardiner and the Type D was restored to its original form. With a top speed in excess of 200 miles per hour and that thundering, whining V-12 behind the driver, there isn’t another driving experience that can match the Auto Union Type D.|
— Official description 
The 1939 Auto Union Type D - abbreviated as AutoUnion Type D - is a classic Grand Prix race car by Auto Union and Audi that debuted in the Hot Wheels Car Pack for Forza Motorsport 5, and is featured as standard in all subsequent Motorsport main titles as well as in Forza Horizon 4.
Unlock in Forza Horizon 4
It is primarily unlockable at the Autoshow, but has also been made available as a seasonal reward once:
- Trial reward - Series 18 Autumn Season
The Type D was a Grand Prix race car whose success in state-sponsored motorsport ended when World War II began. It was the successor to the Type C.
It uses a rear mid-mounted 2,986 cc twin-supercharged V12 with 485 hp (362 kW) and 413 ft·lb (560 N·m) available. The car has a weight of 2816 lb (1277 kg), giving it a power-to-weight ratio of 5.81 lb/2.63 kg per horsepower.
|Speed 8.7||Handling 4.0||Acceleration 8.4||Launch 7.7||Braking 3.6||B 501|
|Unlock: Purchase from the car dealer||Price: 1,650,000 CR or 2,750 T|
|DLC: Requires the Hot Wheels Car Pack|
|Top Speed: 229.8 mph (369.7 km/h)||Body Family: None|
|Acceleration 0-60 mph (0-97 km/h): 3.800 secs.||0-100 mph (0-161 km/h): 8.500 secs.|
|Braking 60-0 mph (97-0 km/h): 114.4 ft (34.9 m)||100-0 mph (161-0 km/h): 315.4 ft (96.1 m)|
|Lateral G's 60 mph (97 km/h): 1.02 g||120 mph (193 km/h): 0.98 g|
|Conversion - Drivetrain|
- In games from Forza Motorsport 6 onwards, the Type D is badged as an Auto Union vehicle.
- During the Series 7 Winter Season from March 28, 2019 to April 4, 2019, the Type D was purchaseable for 650 FP at the Forzathon Shop.