Really the only way to know what your oil is doing is to have an analysis done.
Black oil does not necessary mean it needs to be changed.
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And don't worry about the engine oil turning black. It will lose it's golden-brown colour within a few hundred miles of being put in to the engine. That doesn't mean it's not working. Quite the contrary - it means it is working well. It changes colour as it traps oxidised oil, clots and the flakes of metal that pop off heavily loaded engine parts.
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