thatguy
Elite Member
I think that at the moment the only difference between plain and red diesel is that the dye is added to one, along with the price. I believe that both are ULSD now. But, not long after the time when most of the retail pumps changed to ULSD, LSD was still readily available in the red dye form for off road use.
Around here some places are still selling dyed LSD as heating oil and off road diesel but have ULSD for highway use. It appears that based on what sort of inventory an oil company has on what they are selling for HO and off road.
Brian