Brilliant remark.
Now, what is the percentage of Dra in the oil ?
If it is 1%, then to suppress it means 1% flow increase which is enormous. If it's 3% then !!!!
Reading your post, I have thought about another indirect effect :
if you need 1 day to clean the oil from the Dra, you will have another flow increase equivalent. For example for a 5000 miles pipeline, and a 5 miles/hour speed/flow, the oil takes 1000 hours or 42 days to travel + 1 day to clean the oil.
So 1 day shaved from total transport/cleaning means another 1/43 = +2% flow increase equivalent.
The story gets better and better.