While motor oil may seem like a suitable option for lubricating your bar and chain, it is actually not recommended. Motor oil is designed for use in engines, where it helps to keep moving parts lubricated and protected from wear. However, it is not the best choice for use on a saw chain.
Bar and chain oil is specifically formulated to withstand the high temperatures and extreme pressures that are generated when cutting wood. It also contains additives that help to reduce friction and prevent rusting. Motor oil does not have these same properties, which means that it will not protect your saw or keep it running smoothly. In fact, using motor oil can actually damage your saw over time.
If you're looking for a good bar and chain oil, there are many options available at your local hardware store or online. Just be sure to choose one that is specifically designed for use with chainsaws.