My intuition seems accurate. Some gasket seals, such as K seal, utilise copper while others use stainless steel. It is difficult to discern whether the substance in question is metal shavings, dust, or overspray. If it were indeed metal shavings, they would not be visible. The liquid in the image appears more like water than oil. If it is oil, then the level is excessively high. Could you provide more context about the image? Where is the oil cap located?