It was an ad from Citroën
http://youtube.com/watch?v=CLmE4lby_fI&mode=related&search=
http://youtube.com/watch?v=QdNrQfE9j1c&mode=related&search=

and for movie trailers the original HD versions give almost DVD quality captures vs youtube or other copied versions of the trailers.

garco...i didn't see a Citroën in any of the 4 trailers I found on the transformer site.

http://www.imcdb.org/movie_418279-Transformers.html

Where's the Citroën C4?

Cars From the Trailer

Volkswagen Beetle - One Star


2009 Chevrolet Camaro - Five Stars


Austin Healy


Chevrolet Camaro - Three Stars


Unknown - Two Stars


Peterbilt or White (Optimus Prime)

It is better to not give ratings to the car until you have seen full movie.

Porsche Cayenne Turbo S = One Star


found it on the internet, and i have saw the trailer. its good.

I can only id three of the cars in this screenshot: Daewoo Lanos (left, closest camera) Mercedes-Benz W126 (right of the Lanos and about to be crushed) then a BMW 7-Series (2nd from right)

Daewoo = *
Mercedes = ** (Has close-ups of main characters taking cover next to it)
BMW = *