You probably have mipmaps enabled for the texture, it needs to be set to 8-bit uncompressed RGBA (A8R8G8B8 in OpenIV) with no mipmaps (mipmap setting 1 in OpenIV). That should fix itself when you remove the texture from the .ytd and use the shared one.
Shared generic textures are set in the txdRelationships section at the bottom of the vehicles.meta: