Then I would advise you to follow the second advice: 1 MB files use 50% resize and under 1 MB no resize.
You can always replace the textures that look bad or glitchy with the original .dds file.
Textures that are already optimized will be destroyed by this technique, but many addon cars have a 4k textures and that downscale has no further influence on the quality.
I will edit the post and add that textures may be destroyed and that they should then be replaced by the original .dds file.

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