I don't know if it is different in other parts of the country but around the Midwest, any road taxed diesel fuel is NOT dyed red. Off road diesel fuel or farm use diesel fuel is dyed Red. Home heating oil can be used in any amount but does not have the same additive package. Use some of your favorite Cetane Boost if you run the heating oil. I wouldn't use home heating oil in the dead of winter either......

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Orland Park, IL
1985 300SD 215,000 miles