I have a minor drip at the bottom of the differential. I had the car on my 4 post lift which is pretty well level and decided to add some diff oil. When I removed the fill/check plug on the diff, I had some oil leak out the fill hole so I just reinstalled the plug. Why would there be diff oil running out the plug hole if this is the only time the plug has been removed since the car was manufactured in 2011? The car hadn't been driven for 24 hours and over the winter a few ounces had leaked out.