I have a car model with some logo-textures. The quality of image (at some distance an angles) is so bad, that I can not see the details. Take a look at the attachment:
Is the texture baked into the car’s texture, or is it a separate decal that you stick on? If it’s separate, I believe you could turn off mipmapping to keep the image crisp. If that doesn’t work, play around with the compression settings.
You can still turn mipmapping off if everything is baked into a single texture, but it will look “shimmery” if the car is ever in the distance. I believe there is some way to adjust the distance for mipmap levels as well, but I am not very well versed in this area.