I noticed everytime I use the boat (1994 Mercruiser 3.0 with Alfa One) I was using about an half inch of lower unit oil from the fill resevoir on the engine, cant see any sighn of a leak even after being parked in the same spot, is this a problem? Also while checking it I noticed a (horizonal fin?)on the top of the lower unit had a chunk coming off and when I grabbed it, it came off in my hand, its about 5 inches long 2 wide at the widest part and is closest to the boat. with the outdrive down its hard to see.Is this a problem? Thanks new to mercruiser and the forum. I have a picture but cant seem to get it an address. let me know if you need me to e-mail it to you