I've got an 1989 88 Special Johnson which is leaking, some "jet black oil, down below the cowling. I can't find a definite spot inside the cowling, but it is coming out where the cowling meets the top of the engine shaft. Draining down both sides of the lower unit. Never had this problem before, so this is a new one to me...... Any ideas or has anyone had this same problem before??? Appreciated....