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Is it the vr-1 stuff? If so, it comes out pretty damn dirty after use for supposedly having no detergent.
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Yes there is a street version vr-1 and a racing version vr-1. The racing not only has low detergents but doesn't have anti-corrosion additives.
The reason your oil is dirty is because the dirt is being held in suspension in the oil rather than being cleaned by the detergents.
From the valvoline site:
Valvoline.com > Products > Motor Oil > Racing Motor Oil > Valvoline® Specialty Racing Oil ("Not Street Legal")