I wasn't at the races but from checking out the pictures and what I know of garvey racing on the east coast, most competive boats use dry exhaust instead of wet, for performance issues. Therefore there should be no water quality issues with exhaust oil in the water, even if the engines are two stroke besides a few races a year don't even come close to the amount of pollution that the fishing public creates with their boats.....anyway I'll stop there...but I will say that I was pleasantly surprised to read the number of positive responses...

Matthew