Sounds like you have water mixing with the oil. Possibly a head gasket cracked or similar.
That would be gray matter.
interneurons
All of the cerebral cortex is gray matter as it composed of neuronal cell bodies which are not insulated with myelin.
When engine oil turns gray or milkey cream color, its a sign of moisture in the oil.
gray matter
Gray Matter
Gray matter is a normal part of the brain, not a disease.
Gray Matter Interactive was created in 1994.
Gray Matter Interactive ended in 2005.
Gray Matter - band - was created in 1983.
Gray Matter - band - ended in 1993.
Gray matter is what you call the nerve tissue in your brain because the cells are gray in color.