Why run diesel oil? The other four diesels here run on it and price is good because I buy 20L buckets. I was considering running a change of the cheapest oil I can find to flush it through. But the cheapest oil I can find is 20w50 and within $1/litre of the diesel oil.
It's API CI-4/CF/SL which suggests it's an equally good petrol oil if the viscosity suits.

