Monoposti/Open Wheelers: IndyCars
Touring Cars: ADAC ProCar / FIA World Touring Car Championship
Grand Tourers: American LeMans Series
Prototypes: American LeMans Series
Trucks: FIA European Truck Racing Championship
Motorcycles: MotoGP
Rallying: FIA World Rally Championship
Monoposti/Open Wheelers: Formula 1
Touring Cars: WTCC
Grand Tourers: V8 Supercars
Prototypes: American LeMans Series
Motorcycles: World Superbikes
Rallying: WRC
All 3 NASCAR leagues.
DTM pre uber-expensive
Generally older touring cars.
Merely anything where wheels and doors touch.
And of course the 24h of teh Nordschleife.
F1, GP2, FBM, Le Mans Series, DTM, WRC, IRC, WTCC, FIA GT, Formula Renault 2.0., World Series by Renault, Division 4 sprint and endurance, Division 3 and ICS