Oo. Its like others stated , could be red not taxed or clear in some states ,as to dirty not so . If dirty diesel or heating oil stands for some time gravity will pull the dirt down to the bottom of the tank,thats why we that use a aux tank cut the pick up tube on a slant and not let it extend all the way to the bottom of the tank. P. S if they dip could be the most expressive trip ,up to you. Ron Bissett in Metro Louisville KY.