Yes, if your OB doesn't have a grease fitting on the tilt tube do yourself a favour and pick up one of these.
It replaces one of the nuts on the tilt tube that the cable runs through and allows you to use a grease gun to properly grease the cable and tilt tube.
http://shop.discountmarinesupply.biz/1-STEERING-GUARD-TILT-TUBE-GREASE-ADAPTER-50-28261.htm