This is the first oil change on a truck I recently bought. The oil is Valvoline high zinc racing oil according to the previous owner. I don't believe I have ever seen oil this bubbly. The truck has sat for a few days and the oil was literally cold when I drained it, so I am not sure if that contributes to bubblyness. But my concern, of course, is there is coolant or fuel in it. Would love to hear some opinions.
Looking at it closely, I can see that those micro bubbles are popping at a high rate.