I dont know much about motors but have been cleaning up an old motor for my boat. Its a 1977 7.5hp Ted Williams. I have it cleaned up and looking pretty good, got stuff in the gas tank cleaning it right now got a new spark plug put in but the thing I dont know is if I have to greese or oil the lower end. There is a plug just above the prop that says fill and to me looks like I would use oil in there but I always here people talk about "greese the lower unit". So anyone know if I would greese or oil the lower end?