RKOCH
Fellow Oil Burner
WMO is much thicker than diesel. There is a very fine spectrum which the injectors were designed to work in. In a HUEI injector you have high psi oil that actuates the injector which must be clean. But you also have the fuel side which must be even cleaner and have the correct thickness, ,weight whatever you want to call it to be compressed and push through the injector. If it is too thick , heavy whatever it puts excesive strain on the piston in the injector and so forth. It will start by passing oil thru the injector itself till it fails. When injector seals fail and it fills the fuel with oil you are supposed to drain all the fuel and fill with clean fuel before starting after replacing the injectors. Basically these things were designed with a 0% tolerance for motor oil in the fuel.