What safety measure should be taken when servicing an oil tank?

When servicing an oil tank, ensuring that the tank is isolated and drained of oil is a critical safety measure. This practice significantly reduces the risk of spills and potential hazards associated with handling or working around flammable materials. By isolating the tank, you prevent any inadvertent flow of oil into the system during maintenance, which could lead to leakage, environmental contamination, or even fire hazards. Draining the oil also facilitates a safer working environment, as it minimizes the chance of slick surfaces and allows the technician to inspect the tank and its components without obstruction.

Other choices do not address safety in the same effective manner. Painting the tank does not affect the immediate safety during servicing, and filling the tank to maximum capacity can create overflow risks, especially when conducting maintenance. Removing all oil for disposal, while it might seem like a thorough approach, is not always necessary or practical depending on the servicing being conducted. The focus should always be on ensuring the tank is safely isolated and emptied to mitigate risks effectively.