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Discussion Starter · #1 ·
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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Discussion Starter · #14 ·
Probably condensation. How far or long (time wise) was it driven before changing oil?
It sat for about 3 days prior to changing oil.

As an experiment, I stirred the drained oil thoroughly and put a portion of it into a class container to leave overnight. @RWENUTS, shouldn't the coolant have separated at the bottom of it in the morning? I didn't see anything of the sort though.
 

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Discussion Starter · #18 ·
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
But this is the very first oil change after the engine was built. Wouldn't you expect there to be some fine material as the lifters and cam are wear mated?
 
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