So I've used havoline qs valvoline and Mobil super hm and the havoline got dirty the quickest but it was also my first fill with this car and I believe the engine needed some cleaning. However the valvoline and Mobil both were put in when the engine was clean for sure. So my question is why did the Mobil stay clear looking longer and the valv is already at 500 miles getting color to it. Can any oil gurus explain this to me. Thanks
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