If anyone does not know, diesel is very close to being Home heating oil.
Burning it for fuel oil is nothing new.
I have helped out friends who were low on home heating oil by having them put diesel into it.
The suggestion came from another forum where the owner of a home heating oil company told us to put diesel from the pump into the tank before it ran too low and helped us get it started one very cold sunday night when he could not make a delivery.
Another time a different friend used off road diesel from a neighbor's farm tank to put into his home heating oil tank to get through a period before a delivery could be made.
Here is a link to the difference which is mostly sulfer content and taxing. DIesel from the pump being the cleanest and highest taxed.
https://hartfueling.com/the-difference-between-heating-oil-and-off-road-diesel/
Link about using diesel in home heating oil furnace
https://marstellaroilconcrete.com/blog/diesel-vs-heating-oil/