check these settings in f1graphics.cfg:
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1 ; Increase car texture quality (1 on, 0 off)
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1 ; Animation rendering mode. (0 - cheap lighting, 1 - proper lighting, 2 - VS) v2
3 ; [MAIN VIEW] Texture filter quality (0 => none, 1 => point, 2 => bilinear, 3 => anisotropic, 4 => flatcubic, 5 => gaussiancubic) v3
3 ; [MAIN VIEW] Texture filter quality for mipmaps - if any - (0 => none, 1 => point, 2 => bilinear, 3 => anisotropic, 4 => flatcubic/quincunx, 5 => gaussiancubic) v3
7 ; [MAIN VIEW] Max anisotropic filtering (1 => off, to max 7) v2
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some of my GP4 works ...