Transformers sponsored by general motors?

Question

did general motors, GM, sponsor the transformers movie? because it could just be me, but it seems that all the autobots are general motors vehicles. (chevy, gmc, possibly a modified hummer, pontiac, and Mack truck? don't know if there is any connection on to GM on that one)

Answer 1

gm was in fact a big sponsor of the movie transformers  

Answer 2

There were Fords as well.  Some of the Decepticons were Fords.

The Peterbilt Company is it's own entity.  It isn't affiliated with GM or Ford.

I don't know if that was planned by GM.  

In the cartoon wasn't Bumblebee a VW Bettle?