Sites which are only for subscriptions, or which publish only classified ads or other for-sale content should be submitted to Shopping/Classifieds/Automotive or other appropriate category.
Enthusiast sites should be listed in Recreation/Autos/Enthusiasts or the appropriate subcategory.
If your news or magazine site caters to a more specialised auto subject please submit it to the appropriate News and Ezines category for that subject if one exists (several are listed on this category page). If not then you should still consider whether it would be better placed in the general category for your subject matter.