First.... DO NOT remove the small philips screw from the skeg of the lower unit, that screw is a long piviot shoulder bolt for the internal shift lever.
Look for a large plain slotted screw in the skeg (bottom portion of lower unit). This is the drain and fill screw.
Look higher up the lower unit for a identical plain slotted screw... this is the oil level.
Fill from the bottom screw until the oil starts to flow out of the top oil level hole, then insert the screw into that top hole to create a air pocket.
Now, having the drain/fill screw handy, remove the tube (whatever you're using to fill) from the bottom hole and quickly screw the drain/fill screw by hand into the skeg.
After you're sure that you have hand tightened the fill and oil level screws properly (not cross threaded), tighten securely. Best to use a hand held impact screwdriver to tighten them good!
Use geracase lube 80/90w, available at any marine store, your dealership, Wal*Mart, etc.
