Hi There,
As I understand (and I dont bid in the motor section and there isnt anything contrary in the archives), you shouldnt have any problems. The only thing to watch out for is auctions that require the bidders to pre-register.
From what I have read, motor auctions are quite often cancelled early, so keep that in mind too.
Mrs M is quite experienced in the Motors section, hopefully she will pop in and correct my answer if it needs it.
I would do a *test* run on something you dont want to win, like snipe $1 on a Porsche or something similar. A price you are guaranteed not to win, but hey, if you win a Porsche for $1 dollar, I will take it off your hands.