No, there is absolutely nothing wrong in wat i mentioned and it does make perfect sense.
i will try to explain one more time and it is very basic common sense with no complexities involved.
The VOLUME of oil circulation has INVERSE relationship with the level on Contamination Concentration. More the volume of oil, lesser the contamination concentration and vice versa.
Asaan lafzon mein, if u mix five drops of ink in a glass of water it will change the color of water, however same quantity of ink will have no effect on water color if its mixed in full bucket of water.
hope i made my point clear.