I'd not be too inclined to try regular Diesel fuel in a spark-ignited engine, unless it had direct injection like the old Hesselman engines that used to be popular in Swedish trucks until the '50s or those Evinrude multifuel engines used in small military boats. Spark plug fouling would still leave me concerned anyway. If I would ever attempt to blend gasoline with some heavy fuel other than kerosene, I'd rather add straight vegetable oil or biodiesel instead of regular Diesel.
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