All the major car companies have corporate sites with media/advertising areas with their latest logos in high quality print resolution and usually native files as well. the individual dealerships each have their own access code or password. Sometimes the dealers don't even know about the media/advertising images available because their logos are so readily available elsewhere.
The newest logo WILL be there even if the dealer has not been sent the new logo file.
It's always best to use the file provided by corporate, even if you can find the logo on your own. As his advertiser you should be allowed access to the site. If not, he should go to the site himself a get the file for you. But i always find it's better to get it myself, saves the back and forth of them sending you JPG's when you wanted a native file. They're usually pretty clueless about what to send you, it's outta their job description.