So the other day before fueling Big Ugly I did the usual before hand prep. The proper fuel treatment amount and then an ounce of ND30w oil for each gallon of diesel I'd be putting in... ...then to my dismay I realized I had just poured in a few ounces of the Shell 15w30 diesel oil... I immediately dumped in the ND30w with maybe a bit extra to aswage my guilt followed by the 10 gallons or so of diesel. Started right up and took me home but I haven't touched it since then. Did I screw up?