Where does water in oil tanks typically originate from?

The correct answer highlights that water in oil tanks typically originates from condensation and potentially issues like a broken tank gauge. As temperatures fluctuate, moisture in the air can condense inside the tank. This is especially true in environments with significant temperature changes, where warm air can hold more moisture but cools to allow condensation to occur as it rises in the tank. Additionally, a broken tank gauge can contribute to water ingress, either by creating a pathway for water to enter or by not accurately reflecting the contents of the tank, leading to undetected issues.

While heavy rainfall can lead to water accumulation in poorly sealed external tanks, it is not the primary cause of water found inside tanks. Oil storage temperature can influence condensation, but it is the process of condensation itself that is more directly responsible for water accumulation. Lastly, using unfiltered oil can introduce particulate matter or contaminants but is less directly associated with water presence compared to the effects of temperature-induced condensation.