Seriously? no need to get upset, it is just a bit of oil, if it were poorly machined, I could see it. Why you figure coolant left over from the machining process is unusual, I just don't get, some underpaid china worker had a bad day and missed a little clean up, some don't even bother. And by worse I've ever seen, I didn't mean drenched in machine coolant, I've paid multiple times the cost of this atomizer and gotten black crud, burrs, shavings, it happens. More often on $20 China atties, but happens to the best.