Which statement best describes the relationship between fuel and bar oil usage?

Which statement best describes the relationship between fuel and bar oil usage?

• A. Bar oil runs out before fuel.
• B. The saw uses fuel and bar oil at the same rate.
• C. Fuel runs out before bar oil.
• D. Bar oil lasts indefinitely.

Answer: (C)

Fuel powers the engine, while bar oil only lubricates the chain. The engine burns fuel to generate the power that drives the chain, so the fuel tank is depleted as you run. Bar oil, on the other hand, is a lubricant that is sprayed or leaked onto the bar and chain; it isn’t burned in the engine, and its consumption comes from leakage and lubrication rather than combustion. Because of this, in typical use you’ll reach a point where the fuel runs out before the bar oil reservoir is empty. This is why the statement that fuel runs out before bar oil is the best description. Bar oil won’t last forever and can be used up if you’re often oiling aggressively or if there are leaks, but it’s not consumed at the same rate as fuel, and it usually remains after the fuel is gone.

Fuel powers the engine, while bar oil only lubricates the chain. The engine burns fuel to generate the power that drives the chain, so the fuel tank is depleted as you run. Bar oil, on the other hand, is a lubricant that is sprayed or leaked onto the bar and chain; it isn’t burned in the engine, and its consumption comes from leakage and lubrication rather than combustion. Because of this, in typical use you’ll reach a point where the fuel runs out before the bar oil reservoir is empty. This is why the statement that fuel runs out before bar oil is the best description.

Bar oil won’t last forever and can be used up if you’re often oiling aggressively or if there are leaks, but it’s not consumed at the same rate as fuel, and it usually remains after the fuel is gone.