Thought I could hear a noise, so got it up on a ramp, the casing was wet. Then drips on the monoblocks. The noise turned out to be the new Dunlops, which are way noisier than the cheap rubbish that was on it when I got the car. It's freaky as at 90mph under load it changes drone. Was sure it was the diff, but was wrong. At least no dripping on mono blocks now.