Making sure your bar and chain is lubricated is an important part of maintaining your chain saw. A bar and chain that is not oiled will wear out prematurely and they are expensive to replace. You always want to make sure that you are using chain saw bar and chain oil to lubricate your machine. This bar and chain oil has an additive in it that helps it stay on the chain and not sling off as it goes around the tip. Always check your bar and chain oil before each use to make sure the tank is filled.