I have a Singer 66, and in love with her. I don't know what the 18 is, but you will love her.
Now I see the difference since you posted a picture.. She is very pretty. I don't have the luxury of back tacking, or stitch regulating. I still love her. She purrs like a kitten. Doesn't have any attitude problems, and she is my favorite machine. She was converted from treadle before I got her. The hole for the strap holds my scissors perfectly.
I need to try the Triflow. I bought it for the bike chains. It wasn't cheap, but is needed for the bikes.