If depends ( a bit ) on why you're shooting, I think...
If I 'm going to a car show as a general spectator, I usually have a wide angle lens on my camera, as things are usually kind of cramped, and it's difficult to get a whole car with a 50mm lens ( assuming 35 mm film format). Usually color, Kodak or Fuji 200.
A good friend is a long-time automotive-journalist, both author and photographer, who does feature articles on a given car. Hew tries to shoot the subject vehicle in secluded surroundings, and preferably with a long-focus lens, in the 90 - 135mm vicinity. As to film type / speed: B & W: Tri-X; Color: Kodak Gold 100.
Polarizing filters are handy to minimize unwanted glare.