DIRT CHEAP furnace oil, from the local farmer's co-op, that I burned in my old MB 220D.
Fwiw, the old NA MB diesels will run on most anything that will burn, except gasoline. = Furnace oil is close enough to #2 diesel to work FINE.
Fwiw, I shudder to think about some of the mixtures that I ran in that engine, when we were newlyweds & BOTH of us were trying to go to Tulane on HALF of one scholarship, including used motor oil from the "quick change lubrication" joint, filtered French-fry grease, used AT fluid, soybean oil, rancid Wesson oil, etc., etc., etc. - That old diesel car was slow but just "kept on keeping on" for over a decade.
(We also hunted & fished every day, so that we could eat regularly/decently.)
Btw, we spent our honeymoon in a borrowed tent on Bloody Bayou & spent less than 40 bucks. - We had FUN.
yours, tex
