Sometimes a tank will end up with oil and water in it, the oil will float on top of the water. To check for water, put some water-reactive paste on the end of a tape measure and feed it into the storage tank, the paste will change color if water is present. Any amount of water in your tank should be investigated, because oil will escape through the path the water came in.
During the summer, turn off your furnace, measure the level of oil in your fuel tank using a tape measure or some other measuring device. Measure it again, a few weeks later. If the level is lower, then the tank is probably leaking.
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