The Pro-Oiler works with any kind of oil, recommended is standard engine oil. Just for convenience sake, as you will probably have some at hand.
The standard 125 ml. oil container can contain enough oil to lubricate your chain for thousands of miles.
It is made of plastic that can be molded to fit even the tightest spots. Just use an electric paint stripper, warm up the material and create the best shape for the available space.
Bikes with plenty of room under the seat can order a larger container, like the 175 ml. or even 250 ml.
For more info, see the FAQ sheet and the pictures in the Gallery.