Which of the following is a testing medium for vehicle tanks?

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When testing vehicle tanks, you want a medium that lets leaks show up clearly without creating a fire hazard. Water fits that need perfectly because it’s nonflammable, inexpensive, and leaks are easy to see or detect with simple tools. Light oil is also acceptable because its viscosity and flow characteristics resemble many fuels, so leaks behave more like they would in real use and seals are tested under realistic conditions. Using gas would be dangerous due to flammability, and using the actual product (fuel) for testing introduces unnecessary fire and environmental risks. So the safest and most practical combo is water or light oil, which balances safety with realistic leak detection.