Why is wheel oil provided with a Montolit tile cutter?
This particular cutter is a score &amp; snap tool, not a saw. The oil is just to lubricate the scoring wheel bearing/bushing, and not the cut itself. It's a very different animal from a wet saw, which uses a flood of water. 

Most saws probably don't come with oil because either 1) they use sealed bearings in the scoring wheels, or 2) they don't expect that you'll put enough mileage on the saw to wear through the grease they apply at assembly.