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)?
In: 646
Known as #2 oil or 2-oil.
There’s a 1-oil and a 3-oil.
They’re all based on specs (specifications) depending on its end use.
Off road use (the red or purple dyed diesel) can have higher sulfur content than highway use or 2 oil oil because less of it is used and it’s generally for farming, etc.
Heating oil has a different set of specs and different range of additives than 2 oil but it’s generally a little bit cleaner because it’s used for indoor heating.
Winter vs summer spec primarily refers to a reduction (lower temperature) in pour point (how cold it can still flow) and cloud point (how cold it can get before crystals form)
There are other specs or grades (gasoline at the pump has 3 grades most of us are familiar with) for example there is 6 oil which is #6 fuel oil and is known as bunker fuel because it’s primarily burned in furnaces for locomotion at sea, far away from population centers and are meant as a cheap source of fuel for barges and transit ships.
Marine fuel has a couple of grades and needs to be slightly cleaner because those ships come to land or operate within so many miles of shoreline and so just have less sulfur than say 6-oil.
Tl:Dr, yes there are other number fuels and they tell you what the fuel is used for.
Source: refining chemist
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