Could it be that the overfill of the oil was the cause of the change in engine noise? To find out I went back under the car the next day. I attached a short hose with the little plastic connector that came with my Fumoto oil valve. I was able to drain exactly 0.5 quart of oil from the oil pan by only partially opening the valve to control the flow. Wow! I would not have been able to do this so precisely without the Fumoto valve. Also, I used only one blue paper shop towel for the entire procedure including checking the dipstick afterwards!
