Experiment with the Search Features
Marketplace has some very good options for refining a search, however you can’t rely on sellers to properly categorize the items they wish to sell. Marketplace does have a sub category for vehicles, however, some sellers fail to place their vehicle in that category.
If you are looking for a specific type of car, be sure to do a search both within vehicles and within the whole marketplace. Sometimes doing a search within the whole marketplace yields better results that don’t appear in the sub category searches.