You know how at car shows you get guys from the sticker stores selling Ford, Holden, etc stickers exactly the same as the genuine article.
I've asked these guys who also print them up and none of them have ever received permission from the manufacturer to use their logos. They say, we are just advertising their product so why should they care? I guess so maybe you'ld get a few legal letters if you had a sticker that says Holden (with the genuine logo) sux or something like that.
I was interested because of the stickers we had printed for our website. Not that we've used other companies logos in our designs.
The car I wish I had in the garage :-(