The pump at like every station that has diesel says “diesel no. 2.” What is Diesel #2, and is there a Diesel #1 (or #3)?
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https://www.dieselpowerproducts.com/blog/the-different-types-of-diesel-fuel/ and https://kendrickoil.com/understanding-differences-diesel-fuel-grades/
Looks like there is a #4 diesel fuel as well as a diesel for agricultural use only.
Petroleum is a mix of lots of hydrocarbon molecules. They can be separated roughly by size by boiling it and collecting different parts of the vapors that condense under different conditions. Hence why you have ‘light’ and ‘heavy’. These can be blended to make products with certain properties, including the temperature range at which they still work as fuel.
According to the above links, #1 has more refining steps to remove paraffin waxes that would solidify in cold conditions.
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