Hey all, since i changed my engine oil about a month ago, ive been noticing large patches of oil under my car directly under the oil drain bolt, and ive noticed there is always a drop of oil right on the egde of the oil tank(right next to the bolt), i had a feel of this tank and there doesnt seem to be oil anywhere else except for that drop that always on the corner, and i suspect that it has something to do with the actual bolt or washer or sumthing, was i supposed to grease the washer or anything before i replaced it? All i did was give it a good clean, also this leak has been there since i changed the oil the first time but was not there when i bought the car, does anyone know what could be causing this?

 

Try replacing the copper drain plug gasket