Oil injectors need to be installed over the long rotors to insure better dispersion of the oil Positioning of injectors along the long wing allows for faster incorporation of oil into the batchLong wing sweeps the oil into the rubber where as it may have a tendency to puddle at short wing location and take longer to mixNon-staining oils such as Sardine & Cherine are kept at a much lower storage temperature than Urbonine & Zonflax and this could have an effect on thermocouple differential and tendency to have insulated thermocouples periodically, especially if the oil is taking longer to incorporate because of oil injector position