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Bubbly oil

655 Views 19 Replies 9 Participants Last post by  RWENUTS
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.

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Looking at it closely, I can see that those micro bubbles are popping at a high rate.
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