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What makes the oil black? Blow by? What can cause blow by? Mismatch between the rings and the cylinder liner. Get the engine bore-scoped and checked for bore scoring.
You watch the oil change so you know it is being done, right?
Any oil will absorb partially combusted particles/gases if they leak between the rings and walls. No need to suspect the brand of oil.
You didn't break the engine in, speak of its prior oil change history nor say what your typical drive is so hard to guess at anything else.
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