What color is the car maintenance oil change to prove that the car is healthy?

I used to wonder why the oil was so black, and I thought there was something wrong with the engine. Later, I learned that the engine oil will turn black as long as it is added to the engine, because a small amount of iron chips will be suspended in the engine oil during the operation of the engine. Moreover, the newly added oil will be mixed with the old oil before, which will make the oil black. My car has been replaced by GT Maroon 5 oil. The base oil formula of grade IV PAO has good cleaning effect. After using it for two or three times, it is obvious that the engine sound is lower than before, and the car is much lighter and smoother to drive.