According to the search results, the best vinyl to use for car decals is permanent adhesive vinyl. Permanent vinyl is more durable and can withstand exposure to the elements, making it ideal for use on cars. Oracal 651 and Siser EasyPSV Permanent Vinyl are two popular brands of permanent vinyl that are recommended for car decals. Oracal 651 is known for being water-resistant and UV-resistant, which means that car decals made with this vinyl can last for many years. Siser EasyPSV Permanent Vinyl is a more affordable option that is easy to use and sticks well to any surface. It is important to note that if you plan to place a vinyl decal on your car temporarily, you may use removable vinyl, but it may not stick for a long time.