I have a 1996 disco 86,000 miles, runs good, cools good, uses no oil,lately ive noticed a slight grinding sound coming from the front of the enigine when its cold in the morning, its does go away a little bit, sound like bearings getting ready to go bad, i cant tell if its a oil pump, idle pully, waterpump(which doesnt leak).......?

 

did you do Mikes 60k service? it is in the HOW TO section in the discovery section. I would start with that then if you still have problems we can take it from there. They all leak is the answer.