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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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Just wondering that if you didn’t run the engine to warm the oil prior to draining and you say the bubbles disappear rapidly, then aside from dribbling in the drain pan there doesn’t seem to be a persistent cause???

Bogie
 

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it’s the normal oil over water scenario bogie.
sitting cold the water gathers in the bottom of the pan With the oil above it.
instant cat puke when you start to drain it.
No, water and or coolant mixes in oil looks like and stays looking like chocolate mousse. This has something heavier entrained which looks to be fine metal as a powder. This can be a lot of things but usually is either a failing bearing or cam lobe and lifter material.

My suggestion is send a sample of that oil as stirred to get the whatever into it off to an oil analysis lab. Could be the oil chemistry is separating but that’s damn low on my list. My quick and dirty method would be to stir it with a magnet to see what sticks bearing material won’t but lobe, lifter, and other ferritic hard part material will.

Bogie
 
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