Testing medium for vehicle tanks?

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When testing vehicle tanks, the medium used to pressurize and check for leaks must be safe, compatible with the tank material, and easy to recover after the test. Water works well because it is nonflammable, readily available, and incompressible, so leaks show up reliably under pressure without risking ignition. In some cases, using a light oil instead of water makes sense, especially for tanks that will carry oil products; the oil behaves more like the service liquid, helping reveal leaks under conditions closer to actual use while still being easier to drain and clean afterward. Using gas isn’t desirable due to flammability and safety concerns, and using the actual product as the test medium would waste material and risk contamination. So the practical testing mediums are water or light oil.