There are plenty of websites that offer desktop backgrounds that can be downloaded. The best part is that most of them are free. A little research on the internet can get you to land on a car wallpaper download web site. Any search engine will help you with that. These web sites may have hundreds of car desktop backgrounds that you can choose from. Just pick the one that appeals most to you and you're done. You will have the best digital car wallpaper ready to adorn your desktop. You may also have a look at the car dealer web sites. They usually have the car wallpaper section.
If there are plenty of small icons, just click on a few that look interesting. You will land on the full size wallpaper and the clearer picture will help you decide if you need to go for it or look for an alternative. When it has fully downloaded, right click and choose "set as background" or "set as desktop background" or something similar that may appear indicating that you can set the particular car image as the background on your desktop.
Digital car wallpapers are clean and clear. However, remember to have a look at the wallpaper size. The ideal sizes would be 1024 x 768 and 800 x 600. Choosing a different size may give you a blurred background. If you have any particular car make or model in mind, that would be great. Most web sites have the car wallpapers divided by brand. Visit the brand pages and follow the links - Audi, BMW, Ferrari, Ford, Jaguar, Lamborghini, Mercedes, Porsche, Volkswagen, or whatever car brand wallpaper you are looking for.
Also, you needn't stick on to one digital desktop wallpaper for the rest of your life. New cars come into the market, some get phased out. The digital wallpapers are free. So, even if you cannot afford to buy a new car every other day or month, you can always keep your desktop updated with the latest car. Send a little of your free time in finding one and you will have found the best digital new car wallpaper.