Oil knowledge: How to identify diesel quality?
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Answer: Typically, diesel fuel for vehicles should be a transparent liquid that is colorless, pale yellow, or light brown, with no unusual odor. If the diesel appears soy sauce-colored, has an unpleasant smell, or contains sediments, it is definitely of poor quality. However, it is very difficult to determine the quality of vehicle diesel simply by looking at its appearance; specialized equipment and instruments are required for testing, which is beyond the capabilities of ordinary consumers. The simplest way is to go to large state-owned gas stations to fill up your vehicle; the diesel at these stations comes from **large refineries that use advanced refining processes, ensuring high quality. Comprehensive inspection methods and procedures are in place before the fuel leaves the refinery, so substandard fuel does not make it out.
In principle, there is no inherent connection between the color and quality of oil products. Quality, in the usual sense, refers to high-purity lubricants that meet **standards; a diesel color of 3.5 or lower is considered acceptable. Many chemical materials these days are very light in color; if they are not suitable for blending, it can also affect the quality of the blended diesel.
With the help of instruments, one can test the cetane number, sulfur content, freezing point… and then know for oneself whether it’s good or not. If only a small amount of fuel is added, color and transparency still provide valuable information.
I would like to ask what instruments and equipment are needed for diesel quality analysis, and how much investment is required!
Is the specific gravity of diesel important when in use?