Kerosene (K1) vs #1 heating oil vs Diesel #1
All are #1 oils.
Kerosene is essentially pure clean #1 oil, its made with no or few additives to use in direct vent heaters as to not put out nasty fumes.

#1 heating oil and #1 heating oil is the same stuff but with additive packages such as biocides to protect against unpleasant things that can happen to it sitting in a tank. You can see this if you run these in a kerosene torpedo heater . These heaters will often smoke a bit or smell funny with these oils.

Kerosene can usually be found at heating oil suppliers, look in the yellow pages. Around here Kerosene is $2.25 a gallon. Kerosene is clear, making it good to "cut" #2 diesel. Heating oil is usually died red like off road diesel so cutting with this could concievably get you in trouble.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes