Hi Derek,

I assume you're referring to AdBlue, which isn't an oil as such, but an additive (made of deionized water and urea) that helps reduce harmful emissions from your car's exhaust. The filler location for this varies from model to model. Sometimes it's right next to the fuel filler, but in other cars it's under the bonnet, or hidden in the boot somewhere. Consult your owner's manual or come back to us with your make and model and we should be able to help.