How to Test Diesel Fuel Quality?
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Diesel fuel quality can be tested by observing color, smelling odor, checking impurities, and examining viscosity and foam. Here are some methods for diesel fuel quality testing: 1. Observe color: High-quality vehicle diesel should be a transparent liquid in colorless, light yellow, or light brown, slightly transparent without turbidity; dark black or soy-sauce colored indicates low-grade blended oil; turbid diesel suggests contamination with water or impurities. 2. Smell odor: Premium diesel has a normal fuel smell; inferior diesel may have irritating odors, such as strange or pungent smells from recycled oil. 3. Check impurities: Take a small amount of fuel and filter it through filter paper (or napkin), then observe whether any impurities are filtered out. 4. Examine viscosity and foam: Diesel itself has relatively high viscosity, which increases as temperature drops, meaning diesel has poorer fluidity at low temperatures.