I used to use Rotella in my old ram 5.9L cummins TD and in the ford 6.4 TD and the oil would stay pretty clean up until about 4-5k miles. The Amsoil stays pretty clean up until 5k miles but like everyone else said in a diesel oil will always get dirty. I should show you pictures from the Semi truck lol

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Do your car and move up to Amsoil.